Help with buying an amp

[telephoneman]

I don't have the HiFi kit in my car and after changing the Head unit to an Alpine I wanted a bit more bass. I bought this Sub:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...d=300722827022 but I need an amp to go with it.
I want something cheap and cheerful if poss - any suggestions?

Thanks,

Liam