Ive just had to literally cut my chainset off the crank on my bike because it refused to come off.  So I need to replace the one I have.  Any suggestions?

Im looking at 48/38/28, and its had a cheapy Suntour one until now.  Want something a little better if possible, but dont want to spend over £50 on it because Im not THAT serious about the cycling, its for nipping around town and a I tend to do most of my time on dirt tracks and paths.