Because of having some problems with my hardware i would know what KEXT you installed (i have to install) after a fresh Retail Installation.

My hardware:
MAC OS 10.5.7 Retail
Gigabyte GA-965P-DS3 R3.3,Intel P965, ATX, PCI-Ex
Intel Core 2 Duo E6320 Box 4096Kb, LGA775, 64bit
Scythe Mine Rev. B, Sockel 478,775,754,939,940,AM2
Realtek ALC883 7.1 Channel Audio Codec
Marvel 8056 Gigabit LAN Controller
2048MB-KIT G-Skill PC6400/800,CL 5
4096MB-KIT G-Skill PC8000/1000,CL 5
XFX GeForce 8800GTS 640MB DDR3, PCI-Express
WD Caviar SE16 320GB SATA II 16MB (320 GB)
Samsung SH-D162C (500GB)

I installed the folling now:
OpenHaltRestart.kext
PowerOff bug fix
VoodooHDA.kext

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Snow Leopard 10.6.4
Gigabyte GA-P55-USB3, Intel Core i5 650 - 3,20 GHz, Realtek ALC892, Kingston 4GB, RTL8111E chip, Nvidia GT240 Silent, Maxtor (500GB), Samsung (1,5TB), LG DVD, Samsung DVD Burner

Snow Leopard 10.6.4
Gigabyte GA-965P-DS3, Intel Core 2 Duo E6320 1,8 GHz, Realtek ALC883, Marvel 8056 Gigabit, 2048MB-KIT G-Skill PC6400/800,CL 5, 4096MB-KIT G-Skill PC8000/1000,CL 5, XFX GeForce 8800GTS 640MB DDR3, WD Caviar (500GB), Samsung SH-D162C (500GB), Samsung DVD