Bit of advice needed please.....

I use cubase sx mainly just for midi on my laptop, using external synth, sampler and drum machine.
I want to do more sampling within my laptop so am considering a USB audio solution. Only need one set of stereo inputs (from my AUX outputs on the mixer) and one set of outputs to go to a stereo channel on the desk.
At the moment (using laptops internal soundcard (urg)) I get monster latency and when getting a few audio channels wokring at once it sounds loike I'm in the Rice Crispies factory.
Reducing the latency would be nice but as long as it can playback without popping and crackling I'd be happy....
Cost is a major consideration as I've got about £100 ish to spend.
I was thinking about the M-Audio Audiophile USB but not got much knowledge in this area and was after some suggestions??.

Cheers
Dave