I have almost the same MB as you, GA-EP35C-DS3R. I had previously Leopard running, installed some custom made OSX, dont remember which one, most likely iDeneb or Kalyway. It was running smoothly, apart from sleep and couln't play 3D games. (nVidia kext not proper I guess)
Now I want to install Lion, if possible. Saw other people with same or similar board running it smoothly. Others recommended me iATKOS L2. What do you say?
So, I installed iAtkos yesterdar, but at boot it's freezing (@ apple logo). I remember that I had with Leo the same, but only sometimes and could solve it with startup - commands. Can you maybe tell what should I try and what not? Or in general how could I install it the easy way, since i'm a big noob.
*Made everest report: http://drop.st/B1Z3ff