I would go for an Athlon II x2 since they are only 65W TDP and will be everything you need. I would imagine you can get one of them at either fry's or Microcenter for less than that PhenomII x2. Plenty of CPU while using less power:-)
The Phenom proc came with a free Gigabyte motherboard = $100 which seems to be a better deal than any combo I can find with an Athlon II x2 + mobo.
I should be able to undervolt/underclock that pretty far too, right?