Of those two listed, the Athlon II has the better upgrade path. Ivy, while a great chip, is a dead end. That Athlon II will work in an AM3+ board which allows for an upgrade to an FX 8350. AMD has stated one more processor gen will be AM3+. Many assume that means steamroller as a Piledriver/Vishera refresh isn't on AMD roadmaps. I wouldn't go anything under an Athlon II X4 640 in AM3+.