What would you say is the best value DSLR at the moment? I'm tempted by a refurbished (12 month warranty) Nikon D70S with 18-70mm lense for £430, or a Canon 30D 18-55mm £638. (£738 at jessops and £100 cashback from Canon.) Is the Canon worth the extra £200? Are there any bargains anywhere else at the moment?