In my daily "what tech should I buy" travels I came across this yesterday.
AMD effectively knocked 40% off the value of Intel's low end quad-core CPUs. The Athlon II X4 620 manages to, at $99, perform close enough to the Core 2 Quad Q8200 that the latter simply doesn't make any sense. Add another hundred dollars and you'll get a Core i5 750 (or less will get you into a Phenom II X4 945/955), but if you're on a strict budget you can't beat the 620.
The 630 I'm less excited about simply because it commands a 22% price premium. What the 620 has going for it is its sub-$100 entry price; start going much above that then you might as well be looking at a Phenom II X3.
Considering you can get an AM3 Motherboard that supports DD3 RAM for $54, that's a cheap (but still decently performing) quad system for around $160!
I'll still probably go i5, but this is good news for pricing across the board getting lower.