I seem to be making serious progress
I did a clean install with some new kext combination and qoopz kernel, and I was able to boot all the way to - black screen. I used maxmem=4096 flag. I also got cmos reset with every restart.

I fixed CMOS reset with editing dsdt file, but I couldnt find any kext for my VGA
I saw that people where able to boot to SL with deleting all the ati kexts from S/L/E folder, so I did that and I got a step further - now I have a graphic screen saying that my keyboard is not being recognized.

I have a PS2 keyboard and a voodoops2controller kext in my E/E folder. Iguess it doesnt work, I'm gonna try a better one.

Thank for your help blacknight

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GA MA-790X UD4P, AMD Phenom II X2 550
8 Gb DDR2 667 RAM, ATI HD 3850
WD 640 Gb, Seagate 320 GB
Win XP 64bit & OSX 10.5.5