AMD Sempron 2800+ , Sempron 3100+ and Intel Celeron D 335
 

Which value processor should you choose?. If your budget
resembles a shoestring then a bottom-end Sempron (Socket A, obviously)
or Celeron D 320 are the natural choices. Both CPUs have a number of
cheap-ish supporting motherboards that often feature integrated video as
standard. If your budget is set a little higher, say, at £80 for a
processor (or ~£150 for a processor/motherboard bundle), AMD's K8-class
Sempron 3100+ is comfortably the best choice. It's just a shame that
it's been stripped of 64-bit goodness, though.

Link:
http://www.hexus.net/content/reviews...lld19JRD04Mjc=