Thanks guys for all your advise, all valid points and personal views. I'm sure I probably really don't need to upgrade, but firstly I'm a tech junky and secondly I think you should always buy the best you can at any given time. Regarding a fast prime lens, With my limited photographic knowledge I thought a lens that allows more light in would allow me to take pictures when there's less light available i.e restaurants, street, parties etc without using flash, I do realise there's limitations and at some point a flash will be needed.