Canon 17-85 would slot in nicely and just in budget
http://www.t4cameras.co.uk/index.asp?pname=/moreinfo.asp?id=763
Sigma 17-70
i was going to get this lens, untill i read very mixed reviews. barrel distortion is epic and it has bad CA and Vignetting. also is not at all sharp.
but this is jsut going on reviews, i was still close to getting it untill i compared it to the 17-50 tam
but im sure people have it and enjoy it, and it is a canon lens so im sure it cant be that bad.
Canon 17-85 would slot in nicely and just in budget
http://www.t4cameras.co.uk/index.asp?pname=/moreinfo.asp?id=763