First time builder here to share a few experiences. First this forum is awesome so I definitely want to give back!
My hardware in the sig is my next build but my first was this GA-Z68MA-D2H-B3 mATX for my Mac Mini clone with HD3000 graphics on a i5-2500K. I had some strange moments that some of you may have already experienced, but through diligent research was able to resolve:
1) Unibeast Lion initial boot kept hanging but realized I had my thumb drive in a USB 3.0 slot. Noob mistake and promptly moved to a 2.0 slot. Disabled 3.0 in BIOS for good measure.
2) I was using an Apple keyboard and had the wireless dongle of my mouse in the keyboard USB socket. My Unibeast Lion install would randomly just hang and I got inconsistent messages when I booted in verbose mode. Finally I saw something about a problem with the 3rd USB device. I was like "what 3rd device? I got my keyboard and I got my USB drive." Finally, I noticed my wireless dongle and removed it from my keyboard socket and plugged it directly into my board then voila!
3) Lion install went beautifully at full screen resolution. I ran Multibeast with recommended setting from gold build examples. Half my screen would corrupt during reboot. Only disabling GraphicsEnabler allowed me to boot. Checked "About this Mac" and saw Mac Pro. Went into Multibeast and changed to Mac Mini and that resolved the issue and back to full resolution.
4) Forgot to add my LAN driver from Multibeast so loaded that and again, same graphics problem as above. This time, system was showing as an iMac so changed it again to Mac Mini via Multibeast. Note to self - if I make any changes with Multibeast, make sure to select Mac Mini under definitions.
One last problem for me is that audio works, but the front panel headphones don't. I saw a beta driver in the forums but haven't been able to successfully install. I also haven't tried audio via HDMI but I'm sure there are plenty of advice on these forums.
Thanks to all and keep up the good work!