Just built a custom system using the components listed below and then installed iAtkos L2 using the Customise options also listed below:

Asus P8Z68-V PRO Z68 Socket 1155 8 Channel HD Audio ATX Motherboard
Corsair Vengeance 16GB (4x4GB) DDR3 1600Mhz CL9 1.5V Non-ECC Unbuffered
Be Quiet 530W Pure Power PSU
WD 1TB 3.5" SATA-III 6Gb/s Caviar Black Hard Drive - 7200rpm 64MB Cache
BitFenix Shinobi Black Mid Tower Case
Intel Core i5 2500K 3.3GHz Socket 1155 6MB Cache Retail Boxed Processor
LiteOn iHAS224 24x DVD±RW DL RAM & Lightscribe SATA Optical Drive - OEM Black
Microsoft Digital Media Keyboard 3000 - USB
Microsoft Comfort Mouse 4500 5 Button - Wired USB with Bluetrack Technology
HANNS-G HH221DP Full HD TFT LCD 21.5" DVI-D Monitor with Speakers

Asus GTX 550 Ti 1GB

iAtkos Customise Settings used
--- Chameleon 2.1 (default)
Bootloader Options
--- Graphics Enabler (default)
--- Built-in Ethernet (default)
--- FakeSMC (default)
--- Disabler (default)
--- RTC (default)
--- EvOreboot (default)
- Main Hardware
- Sound
-- AppleHDA < Checked this Box to select all sub boxes
- USB < Checked this Box to select all sub boxes
- VGA < Left Unchecked; Nothing Selected
- Network
-- Wired
--- Intel Gigabit

I could probably refine this install but as a first install it works well, Screen res is high, network works nicely, sound is good. Boots up fine and quickly, actually faster than my mates G5 with Lion

I think this system would probably run very well with a dsdt.aml modded, unfortunately this system, is destined to be a Windows 7 x64 PC for a customer, I just wanted to see if iATKOS L2 would install ok. I have to say it was a nice straight forward install, I didn't have to put any boot flags in not even -v

oh and all the components came to £850 not a bad price for a New Hackintosh

Update: just checked the customise option GF100 under VGA and that works just as well.