after a bit of research of my own, i got dissapointed as there seems no
updated kext in the near future:

http://forum.insanelymac.com/index.php?showtopic=90112
and 10.5.3 update brings G94 support
http://netkas.org/?p=60

i found an alternative: ati/amd HD 3870 almost same price and performance (under windows)
and it is supported by osx
http://forum.insanelymac.com/index.php?showtopic=94090

so maybe i should get these?

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Leopard 10.6.5 | Core i3 | Gigabyte H55M-USB3 | ATI 5770 | Coolermaster Cosmos