I have a wacom graphire 4. $100 (US). don't know the conversions to pounds but it is pretty tight. I think you would be satisfied with it, it's very comfortable to work with but i'm not very skilled with it yet.
go for a wacom, never trust a Trust , I know, they are really cheap, but wacom offers you more quality I think. Now, you got a good budget for a intuos 3 a5 or maybe a a4, What I heard of them they are really great working with. The one thing you need to think of is what size YOU think best suits you, try if you don't know. but otherwise, I should have choosen the a4, i think it will work for me, I'm upgrading to one fo thoose in a short while