MiniITX FTW!
Here's my system components:
Z68X-UD3H-B3 rev 1.3 UEFI
i5-2500K SB
Corsair Vengeance LP 16GB
OCZ Agility 120 SSD (OSX)
Seagate Barracuda 1TB (Files)
Sony Optiarc DVD
Best Connectivity PCI Express IEEE1394b
Corsair TX550M
NZXT H2 Classic Silent Mid Tower
I had some issues installing ML 10.8.2, but MiniITX was gracious and patient enough to help me through it.
1) Hooked up all my components and left them that way (didn't disconnect anything, other than peripherals)
2) In UEFI BIOS I did the following extras in the peripherals menu
VIA 1394 Controller set to DISABLED
Internal graphics set to ENABLE
Init Display First set to IGFX
3) I installed OSX in Verbose mode up until the MultBeast stage
4) Used the following settings in MultiBeast
User DSDT or DSDT Free
ALC889 without DSDT
3rd Party SATA
TRIM (for my SSD)
FAKE SMC
Realtek Gigabite Ethernet
Legacy USB
USB 3.0 Caldigit
Chimera V1.11.1
1080 Patch (so my display resolution would save after reboot)
SSDT - Sand Bridge i5
Mac Mini Profile
BAM! ethernet, integrated audio, HD 3000, manual/auto sleep, everything works like a charm