I am considering switching from a 1.4ghz Thunderbird with a ECS K7S5A to a 1.6A(Will overclock to around 2.2ghz, sticking to standard HSF) and a corresponding motherboard. Assuming I can sell my old MB and processor for 140, that covers the price of the new processor, leaving the cost as the motherboard. First, is it worth it? Second, is a MSI 645 Ultra ok (71) or a ABIT SD7-533 (79)? I am trying to keep costs down. With standard air cooling, and Crucial 2100 ram, will I be able to reach 2.2 or higher? One final question, is 300W enough? Thanks