What Processor should i buy for this motherboard?

I have currently got a AMD Sempron 3400+, 1.81 GHZ. I have used Si Soft Sandra and it gave me an overview. SiSoftware Sandra Processor Model : AMD Sempron(tm) Processor 3400+ Speed : 1.81GHz Cores per Processor : 1 Unit(s) Threads per Core : 1 Unit(s) Internal Data Cache : 64kB, Synchronous, Write-Back, 2-way, Exclusive, [...] http://bit.ly/r4yngP