3000 is worth it, 939 3000 is not.
you are forced to use MSI as the best board, it costs 40 dollars more, the chip cost 40 dollars more, the chipset only works well if you have dual set of ram....
kv8 pro is 105 dollars shipped in retail box, 3000 is whatever you find it as, both make for a very fast gaming machine.
(i have one! just have 1 gig of ram so it even works better than it did with 512. I run faster than a p4 3.0 ghz, and a heck of a lot cooler..... its the thing to get right now for power for dollars, intel or amd fanboy's whatever, its best deal for the dollar. I recommend 754, but if you can, afford the 939 so long as you dont get a crap board with problems (msi does that often)