well it depends on quality, ANtec overall is good, if u r going with what u decided then its OK as well.
but its as well 114$. and you can find the PSU @ 550W in range of 35 - 150$, that obviouly is quality dependent. i'll recommend spending some money in case of PSU, as it runs every part of system.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"