Ok, was going to wait till this Spring to waterblock my 780Ti classies, but got tired of waiting for the snow to melt!
 
I went with EK waterblocks, but stuck with the EVGA 780Ti Classy backplates and thought I'd share how it all came together. 
 

These are the screws I used - ordered them from Mr. Metric.   They worked perfectly to secure the EVGA 780ti Classified backplate to the EK waterblock and look great.  I installed the EK block per instructions, but note that I used the M3x8 screws to actually secure the EVGA backplate to the EK block.  The M3x6 screws are strictly for cosmetics - I used them to plug the EVGA backplate holes that don't go anywhere, i.e. the ones with no matching screw holes going into the EK block.  (Tip:  Use a small BB sized ball of poster mounting putty in the EVGA backplate holes that don't go anywhere - this will help secure the screws in place and keep them from falling out or rattling around.  Strictly cosmetic, but looks a lot better than leaving empty holes unplugged in the EVGA backplate.)
 
Here are some more pics:

 





 
I'm really happy with how it all turned out.  The EK blocks and the EK terminal are great!  The GPU's are nice and cool now... idle at 19C and only hit 35C under full load.
 

nice score on valley dude..

Dude help me !!!, did you use any washers between the back plate screws and the pcb itself? I have an EK waterblock and the instructions say to put washers when connecting the waterblock and the card. Thanks a ton man
 
also would these screws work? 
http://www.homedepot.com/p/Crown-Bolt-M3-0-5-x-8-mm-Zinc-Metric-Socket-Cap-Screw-3-Pack-37058/202836102
 
Thanks a ton man

very cool..

haris525Dude help me !!!, did you use any washers between the back plate screws and the pcb itself? I have an EK waterblock and the instructions say to put washers when connecting the waterblock and the card. Thanks a ton man also would these screws work? http://www.homedepot.com/p/Crown-Bolt-M3-0-5-x-8-mm-Zinc-Metric-Socket-Cap-Screw-3-Pack-37058/202836102Thanks a ton man

The EVGA backplate already has a resistive film covering its underside, so no worry or need to mess with washers (at least I didn't and everything turned out fine.)   The EK waterblock uses washers though and I believe the EK backplate does as well, but the EVGA backplate doesn't seem to need them.  Yes the screws you link should work... but those huge end caps they have are going to stick out like a sore thumb... way above the surface of the backplate itself by a good margin.  I'd advise against those home depot bolts unless you don't care about cosmetics.  The ones I show in my first pick from Mr. Metric work great.  They aren't all that expensive and you can see just how flush they are in the 4th pic I posted. Cheers!

Dude can you specify which rads,pump and tubing you are using....All watercooling setup. I arrived here late though.