would a evga x79 be way over kill for doing a video encoding with light gaming rig???  want id came with is a single or dual 680s.  i had a p55 ftw 200 but it got killed with what i do in music and video, was to much stress on it hence why i am worried about going with an z77.  so do u all think one of the 3 x79 evga boards might be good for me?

I do LOT of encoding and it's one of the main reasons I went from my X58 FTW3 to the X79 Platform. I had the chance to get decent money for my previous rig from my brother as he ALWAYS likes running about 1 gen behind and he KNOWS he could not get what I have at the price I am going to sell it to him PLUS he gets me to install and transfer everything along with total setup...
 
Money, for me, is the value of bang for the buck, and the best memory I can get. This  ALWAYS rule my choices on computer gear. For those reasons I chose the SLI over the FTW.
1. I am probable NEVER going to run more than 2 video 
    cards and IF I do the SLI will run it.
2. 6+2 Phase PWM vs 12+2 Phase PWM will not make much
    of a difference with me as I OC, but I am NOT bleeding 
    edge though  6+2 Phase PWM will let you OC JUST as
    well, JUST not quite as efficient.
3. The FTW has a 90 degree 24v Power connector, 100%
     POS caps vs. those around the CPU where it really
     counts, the rest are solid caps which are MORE that  
    good enough for me! I will never see a difference... The 
    same thing goes with the amount of Gold in the socket.
    Better yes, see a difference debatable... Onboard USB 3.0
    headers vs None on the SLI and some other minor things.
4. One thing that MAY not be so minor is the SLI is an ATX
     board vs an E-ATX board for the FTW. IF you have the
     wrong case then the E-Atx board WILL not fit.
5. The Classy is even bigger but that is so you can add 4
    video cards SHOULD you chose that...
6. MY biggest reason are performance vs bang for the Buck...
     I chose the I7 3820 which I got for $229 at Microcenter.
     CHOSE at the RIGHT time and it costs you $199.00. The
     other CPUs are better, but what 10%-15% better at   
     ALMOST 50% more money??? I mean do NOT get me
     wrong, IF money as not an issue I would have spent it...
     For ME the 3820 ROCKS at a great price...  WITH a
     Rebate from EVGA at Newegg you are spending $229 for
     a GREAT MB. I took the $100 I saved and bought Corsair
     Dominator GT memory as it is said to be the best here is.
 
Keep in mind these are MY reasons for chosing what I did. I hope they help you. Others here WILL chime in but I tried to be a complete as possible with my personal thought process. There is NO wrong choice, ONLY what's best for you and only you can chose that.