The build excella listed is really good, but I'm really not a fan of Rosewill's Green-series power supplies. I'd be much more inclined to pay the difference and get a reliable unit instead (XFX Pro Series, Rosewill Capstone, etc).
If that's a hard $700 cap, then I'd suggest switching the FX-4300 for a Phenom II X4 965BE. It's not as fast as the 4300, but it's $40 less (certainly not $40 slower, though).
Righteous. I'd take that list excella posted, and replace that power supply with either this XFX PRO450W Core, or this Rosewill Capstone 450M if you'd prefer a modular power supply. The XFX should be about $10 more, but it offers a $10 rebate. The Capstone will be about $20 more, with no other discounts.
Those power supplies are manufactured by Seasonic and Super Flower (respectively), who are known for high-quality, reliable units. The Green is manufactured by ATNG which is known for making cheap, shoddy power supplies.
I don't really have anything else to contribute, so if you've got questions, ask away.
Rosewill Green is fine.
There have been no known or mass reliability or efficiency issues with it and it has almost maxed up amperage on the +12v rail compared to some other mediocre series lines from other reputable brands.
The reason why it's so cheap right now is because Newegg currently has a promo on it. It's basically a steal.