Thanks for all the advice so far.
Half the reason I was looking at the 450D was that I wanted to be able to get some largish prints of my photos, and I know it has a 12.2 megapixel sensor..... will that enable me to print them much bigger than a 10 megapixel one?
The stock lens (18-55mm IS) is £50 Colmo.... should I bother? The 55-250mm IS is another £180 on top of that............ I take it I should definitely give that one a miss?