Never thinks about thermaltake PSU. They makes the best cases around, but the poorest PSUs. Buy one Antec True Power 550 W or something for future upgrading.
Also, consider again your graphic card. Buy a 7600 Gt for quite the same price but much increased performance.
DFI Lan party UT NF4 Ultra
AMD Opteron 146 2.0 Mhz @ 2.8 GHz
OCZ Gold Edition 2x512 MB DDR 500 timing 2.5-3-3-8 @ DDR 560
XFX GeForce 7600 GT 256 Mb GDDR3
Antec Lanboy Mini Tower Case
Antec True Control 550W ATX2.0 PSU
Maxtor 300 GB 7200 RMP SATA 16Mb Cache
17\'\' TFT Screen 12 ms