For the Core 2 Duo rig, get the 'regular' P5B Deluxe for $184.99. The only difference is the lack of WiFi (which ain't that great anyways). Then, get the E6300 instead of the E6400, saving another $39.50. This will save up about $80, and you should get the 2GB RAM
If you go for AMD, please PLEASE don't get that ECS board if you think about overclocking (although the Core 2 Duo rig is much better). Also, why did you pick a cheapo cooler for the AM2 rig?
And what is wrong with the ECS board? And I could just get a typhoon for like 10-15 dollars more, I didn't think the AC64 was a "cheapo". What about the Asus M2R32-MVP board? (Sorry for all the questions )
Edit: http://www.newegg.com/Product/Produc...82E16813128017 is that the same motherboard you posted? A lot less expensive here..