The AMD 965 is a good bargin right now and will be just fine for gaming and basic PC ops. If you buy an AM3+ mobo it will run your 965 and the new Bulldozer CPUs when you decide to upgrade down the road so you get a good return on your investment.
Z68 motherboards will also run Ivy Bridge when it comes out. If it's in your budget I think the i5-2500K is definitely worth the money. The 965 competes, though, especially if you can't spend $200 on your chip. Watch out for bottlenecks, though.
Whatever you get make sure your mobo has PCIe 3.0 slots if you plan on upgrading. They can't be used until Ivy Bridge/Bulldozer, but if you upgrade in two or three years I think you'll be glad you have them.