My parents need a new computer and I'm going to do my first build for them as im studying for an A+ cert i thought it would be a good opportunity. Its would be rarely used intensively and im probably looking to have as "green" a computer as possible to save them money but Microcenter has Athlon II x4 630, phenom II x3 720, and phenom II x2 555 all priced close enough together. Im not sure on if i should get the higher GHz dual core at 80W or go for the triple or quad cores at 95W solely because they have more cores and are comparable in price?