That CPU is AM3 and you could pretty much use any AM3 processor.
The 965 BE for example is now < $100
that CPU will work in some AM2+ boards as well if there is BIOS support for it.
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Corsair Carbide 300R, TX850V2, Asus M5A99FX PRO R2.0, Phenom II 965 C3 BE, G.SKILL RipjawsX DDR3-2133 8 GB, GTX 260 SLI, Asus PA238QR, Windows 7 x64 Enterprise
Asus M4A77D, Athlon64 X2 4200+, DDR2-800 6 GB, HD 5450, cheap 450W, Server 2012