Paul - how much do you want to spend ? Really good glass can cost shedloads If you want a sharp image, and a fixed length then on a small budget you can't go wrong with the Canon 50mm f1.8 mark II (if you can get hold of a mark I, the build quality is better though) http://www.amazon.co.uk/Canon-EF-50mm-1-8-Lens/dp/B00005K47X