if u wanna o'c hv u thought bout the PSU and oso the HSF
coz u need a good n stable psu for o'c
oso a good cooling unit os that ur proc wont burn

1) go for X2 3800+
2) biostar 6100 oso good
3) i prefer corsair than kingston..get the 512mb*2 instead a 1gb
4) 7600gt better than X1600
5) depends on ur budget..there is a lot of gud n nice lookin case there @ lowyat