Most psus that come with cases outside of antec are garbage. Just go out and buy a good quality one and throw outt the one that comes with the system. When you pay $50 for a case with a psu, you know that the psu did not cost much. I do not trust my system with a cheap psu, it is worth it to get a good one.
Abit BP6 2X 300A@450 mhz, 1.5 GB PC133 ECC, Renditon Verite V2200, SB AWE32, Adaptec 2940U2W, 4.3GB Quantum Atlas 10K, Plextor Ultraplex