AMD processor upgrade

[ikonix360]

I have the following AMD processor in a Dell Inspiron 1521 laptop.

AMD Turion 64 X2 Mobile technology TL-58 - TMDTL58HAX5DC

http://www.cpu-world.com/CPUs/K8/AMD-Turion 64 X2 Mobile technology TL-58 - TMDTL58HAX5DC.html

Any idea what the best processor I can run is?