Decent, but not the best performance/price.
It uses DDR ram; DDR2 is taking over. An Intel Core 2 Duo processor or an AM2 x2 processor would be better performers for just about the same price as the procesor that comes with the one you chose.
You wanna be looking at either the Intel Core 2 Duo E6300 processor, or the AM2 x2 3800+ if you want something a little cheaper.
If you really wanna build a PC ground up, then we can proly suggest some good routes to take. Whats your budget?