Cheap Heatsink & Fan For AMD Sempron 2500+?

Hey, I'm Currently running an AMD Sempron 2500+, 1.75Ghz. At the moment I'm still using the heatsink + fan which was supplied with the processor and temeratures idle around 40C and hit 50C under load. I'm trying to get my temps AS LOW AS HUMANLY POSSIBLE. Does anyone know a cpu cooler that might be good for the job but won't cost me a fortune?

P.S The reason for this is that im thinking of going for an overclock and I just want to get things real cold first

 

Yep, A Thermalright SI-97a
This is the best Bang for your BUCK, the only thing better is water.
http://www.jab-tech.com/ThermalRight-SI-97A-pr-2999.html
also add the Panaflo H1b fan

 

Wow, looks like a beast Any idea what sort of temp I'll be looking at once installed?

 

35C to 45C I'd expect. Stock heatsinks suck majorly.