i think doom 3 will be better but will come out like 1-2 years after unreal 2 so i wouldn't really rate them in the same class

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Classic Athlon 700
FIC SD-11 mobo
384mg PC133 CL3 ECC Crucial RAM
20GB ata66 7200 Maxtor
30gb ata100 7200 Maxtor
ATI Radeon 64mg VIVO
Sound Blaster Platinum
Plextor 12X/10X/32X
Pioneer 16x DVD slot load
Enlight 7237 w/antec 300watt ps