Hello everyone, I have around 800-900 $ and I need a gaming pc that can handle mostly any game on a single monitor for now,
and I also want it to be upgradable in the future, I'm mostly concerned  about adding another GPU.

here's the list of components  i've come up with so far /
Asus P8Z77-V , the thing with this mother board is that I'm lost between the different versions of it, there's le, lk , pro , deluxe however is too much for me
Intel Core i5-3570K
GeForce GTX 660 2GB, but i'm between Gigabyte and EVGA (keep in mind ill use dual GPUs in the future)
corsair vengeance 2x4 gb blue kit
WD 1TB Caviar black
probably an affordable SSD for the system as well
Cooler Master hyper 212+ for the cpu
Corsair CX600
NZXT Guardian black mid tower with blue led, as I want the overall look of pc to be blue

tell me what needs modification, cuz i really don't know much cuz this is my first project :/

Looks good but if you plan on playing high graphics, 3d surround or anything like that I would recommend you get the 3g model of the 660s. I know some will probably say it is nothing to worry about but it seems to help me play my games at higher resolution. Also there is a lot of speculation between the 2g and 4g models of the 670/680s saying the 2g model is pointless, so I would assume the 3g model would be better then the 2g model in the 660 series for higher graphic settings/resolutions. 
 
I would also recommend you getting a 750w+ psu if you do infact plan to sli later on. I would also recommend a full tower case over mid tower case. Had a discussion with a lot of folders the other day about this. The full tower cases allow for better air flow for sli gpus as well as it having more room for additions to the rig. 
 
Everything else seems fine. I would grab a 180g+ SSD if you can so you can load your OS on it as well as your most played games/programs for faster loading times. 
 
Hyper 212+ is a great cooler but if you can I would get an AIO Watercooler. Will probably work a bit better for the new gen intels. I hear they run hot especially if overclocked. 
 

You can get a 660 3g model for around 250 i think. You can probably find them used on a forum for around 200. 
 
http://www.evga.com/Produ...aspx?pn=03G-P4-2666-KR
 
259.99 with a 20 dollar mail in rebate so it comes out to 239.99
 

McMada

get a 660ti and a a good 650 watt psu can power that system with 660ti sli, like the evga supernova 650 watt, hx/ax corsair 650 watt and since you are on a budget get the p8z77-v lk.

+1

Waleed Alghamdi

the evga 660 3gb superclocked sounds good, that will be my choice for now, sorry for the  stupid question but how do the size of gpu ram effect the performance ? I mean i know it surely does effect it but by how much, cuz someone once told me there isn't a big difference if the ram is bigger, for example which is better, a 2gb gtx670 or a 3gb gtx660 ?

The more RAM you have the more you can increase the detail in games. Of course the more you do this the more power you also need. If you do not have enough RAM and you hit that "Wall" you can have the tendency to stutter.
The GTX670 would be better, as it is more powerful, but you may not be able to increase the detail as much. Games now are starting to hit 2GB at 1080p with in game settings at max. Some like Crysis 3 already going beyond that.

Why every time someone asks about a budget built, no one respects the budget? Most everyone makes suggestions that keep breaching the budget.    

Waleed Alghamdi I need a gaming pc that can handle mostly any game on a single monitor for now

What do you mean by "handle" regarding your gaming and graphics preference?  We're all different; but those in these forums tend to think in terms of max detail smooth (generally near or above 60fps) and no $250 card will make that happen, unless you didn't need max detail smooth or simply have a lower frame rate or quality tolerance.  Especially when you consider future games at the same quality preference will use more resources than games of today, you should try planning ahead or tone down you expectations for game quality.

Waleed Alghamdi 
you guys are right, I should get a 750w or so, but the thing is, GPUs are expensive, a slight change to them will ruin the budget, so for maximum 250$ what gpu should i get ? and ill buy another one in 2 months or so, so what do you think ?

May I suggest you use integrated video in the 3570K CPU (or some cheap graphics card) until which time you can save up for a better graphics card than $250 will buy in the next few months?  Remember, "good things come to those who wait"; just make sure the motherboard has a video port that matches your monitor.

that was another choice i was thinking about, which is if even dual 660 wont be good for smooth gaming then ill wait and buy 
a good video card with around 400-500

so what im trying to say is, should i get a 2gb gtx 660 and later on buy another one only if putting them in sli mode will give me 
a smooth experience .

but, if even 2 gtx 660 2gb in sli, wont give me smooth experience even though im using a single monitor then ill have to put more money into the gpu and buy a 680 maybe.

so what do you think ?

2 gtx 660 should give you good smooth gaming. I'm running 2 560 1gig cards in sli and have never had a game a could not play and I play about all my games on high.  my specs are amd 1090t, 8 gigs ram, 2 560 ti fpb, 23.5 acer 3d monitor.

Xtrem

I would stick with a single card, 670 or 680 when you have the cash, you wouldn't need a super powerful PSU and less chance of microstutters.

Good point here. I have been hearing about a lot of head aches with games lately with gamers having SLI rigs. Might be a good idea to just get a single card.