My Specs:

G31M-ES2L Motherboard
nVidia GeForce 9500GT PCI-e GPU
4GB DDR2 800 Memory
200GB SATA II Hard Drive
DVD-ROM
Onboard Sound w/ VoodooHDA kext
Onboard Ethernet w/ AR8131 kext
Snow Leopard 10.6.4
Avid Media Composer 5.0
Final Cut Studio 3
MPEG Streamclip
Handbrake

I was using the LegacyALC883 & AppleHDA kexts but they kept crashing my Avid due to "failed to initialize audio hardware", but I found the VoodooHDA kext, tried it and BAM! works great plus it gives me the port selection in Audio Options

My system has been running stable for 3 Days about 4-8hrs per day. Haven't had a chance to test Avid & Final Cut, but hopefully I will this week sometime. I'll be running some RED Cam Footage and 5D Footage to test and see how it handles on the Hack Pro.