yeah i recomend a separate PSU too, except it's a well know named psu, well PSUs came with cases are mostly for not a very demanding system, low on the 12v rail.
also thermaltake is good.
i use a thermaltake and never have any problems with it
(it came with my case)
__________________ Athlon 64 3200+
GigaByte GA K8N-SLI
1GB Corsair Select Value
GigaByte 7300GS
80GB maxtor Hard Disk
Samsung Writemaster DVD-RWDL 16x
Thermaltake mambo case w/ 430 PSU
Windows XP Pro
17\" Proview LCD