i have my 3700+ at 2.6Ghz on the stock cooler, no problems. i've done 2.86, but left a house fan blowing straight onto my board to keep it cool. so you should be able to hold 2.6Ghz no problem on the stock cooler, maybe even 2.7 or 2.8Ghz if you're lucky.
Yes can get 400MHz, but you can even take it further to 550MHz. I have the same chip, 4000+ SD and right now I'm at 2940MHz on STOCK cooling. Idle temp is about 35ºC, and full load is 47ºC. You could go even higher if you have better ram, better than what I have right now at least.
I am almost positive that your Corsair memory is better than mine because I got the valueselect and yours is XMS. You should be good to go, just find out the max's on your board if you don't know them already, including your new cpu
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