The bare minimum kexts you would need for almost any machine are:

- FakeSMC or a decrypter like dsmos.
- NullCPUPowerManagement or another disabler for AppleIntelCPUPowerManagement, not all machines require that but for booting the installer is the safer bet.
- OpenHaltRestart: to avoid crashes or long wait times in restart.
- VoodooPS2Controller+ACPIPS2Nub: if you are using PS/2 Mouse or Keyboard.
- PlatformUUID: I think its not really needed for the installer but you could just include it just in case, specially if you dont have a well supported ethernet card. You may need to edit the PlatformUUID, I'm not sure if thats really needed too but just in case...

Machine-specific kexts:
- If you get troubles with the installer switching into graphical mode you may need to delete the framebuffer kexts. Alternatively with a supported card using an EFI String or Chameleon RC3/PCEFI 10.3 graphics injecter option could work too. In your case I think the 9800 should be supported (unsure).
- If your SATA or IDE controller are not natively supported by Snow you need to add a kext, in your case, if your mobo doesnt support AHCI mode you would need a modded AppleIntelPIIXATA/IOATAFamily for Snow.

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AsRock P45TS | C2D E8200 | GeForce 8600GTS
Mac OS X Snow Leopard 10.6.1 + Windows 7 Ultimate 6.1.7600 + Fedora 11