I have the same set up and iatkos v4a installed with no problem the sound and graphics had to be worked on but the core system was not hard. If you do the basic (just choose kernel, remove thermal kext, and laptop battery) it will boot up the voodooHDA is what I used for sound and I had a few keyboard problems sometimes it worked other times it did not so the ps/2 keyboard with trackpad fixed that. The geforce 6100 I had big problems with but that may have been because it is a goforce go card so you may have to play with that I did get it to update to 10.5.5 today I am going to try the new kernel but if you want to get a working OS X I would give iatkos v4a AMD only a shot
good luck