Looks like you're limited to 95W CPUs, so no 9850 for you. You're best off with a Athlon II X4 640.http://www.newegg.com/Product/Product.aspx?Item=N82E16819103871
Just make sure you update the BIOS for it and pay attention to the notes on the last column.
that makes me laugh...:
I had the same board: Asus M2N-E before (same board, in fact, mine has the second PCI-e slot solders, just not the plastic piece you need to put the card in there, basically same board though, just mine had a lower price tag) and I actually put a 125 watt CPU in there... it worked, but wasn't entirely stable... so I underclocked it by 400 Mhz...
Phenom 9750 I think? dont remember exactly what it was.... I quickly traded it for a dual core black edition CPU which worked a lot better since I game and it had higher frequency.
Either way back to you, I would indeed go for the triple core CPU mentioned above, youll get better performance from it. The first Phenom series were rubbish.