|Your board is actually pretty outdated, so Pentium D 925 is the best dual core 3 GHz supported.|
I have to warn you that PD 925 is also based on NetBurst architecture, which is quite outdated, so it`s basically 2xP4 in one package.
What do you use the computer for? My general recommendation would be Pentium Dual Core E5400 (which is based on totally different architecture than Pentium D), GIGABYTE GA-G31M-ES2L and 1 or 2 GB DDR2 memory.
G31 motherboard - 52$
Corsair 2x1GB 800MHz memory - 35$
...which equals ~160$, and you get much more from the system.
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