Recommend me an interface for recording guitar.

[pdshootandscore]

Sup,

Here's what I want to do:

• 
  Record some songs with software e.g. amplitube/guitar rig/podfarm

• Grab an SM57 at a later date and mic my amp up

Budget: up to £150, although tell me if there's some slightly more expensive ones that are much better quality or something I could save and go a little higher if it's really worth it.

ty in advanced

edit: also, how can you run audio from multiple programs (youtube, itunes etc) at once whilst using programs like guitar rig?

 

[MG Eddie]

M-audio fast track pro 150$ NEW. I have this one and find it to be a reliable machine.