It may be reliable, but not as powerful as a OCZ Gamexstream if you want it
. But the antec has power and it is reliable too. Save some money and get a Scythe ninja or Scythe Cool Mine for a heatsink. Both work great. My P4 idles at about 35C and never goes above 48C on load.
Edit: i dont kno if the ninja has a mountin kit for AM2, but the Cool mine does
You could also wait till the end of the month, that X2 will be about $170 which is almost half the price of what it is now. So you could either get that X2 or get a better X2 for the same price as that one now or you can get a conroe, but either way u'll have a good CPU
everything else looks great, you'll have a nice system