I don't think the CM Real Power Pro 650w PSU falls into the "avoid at all costs" category. It's a fair choice for a gaming build on a tight budget. It also has 8-pin PCI-e connectors which is a nice choice.
Have you looked at the CM RC-690 case
? Its $45 after rebates or $125 less than the Cosmos 1000 and its had decent reviews RC 690 review
For other ideas on other system components check this AMD Mid-Range Gaming guide.
You'll note they DO recommend the X2 5000 Black Edition but then they're not using it as a place holder for a Phenom. An upgrade from the 8800GTS to 8800GT is worth the short wait while the release prices stablize.
Phenom's are drop in compatible with AM2 motherboards at HyperTransport 2 bus speeds while socket AM2+ motherboards will offer HyperTransport 3 bus speeds
If you want to upgrade the PSU a bit you can't go wrong with the Corsair HX 520