NO supaguard, it's only wax! at that price get Paintshield, a must-have in my eyes, I'm not regretting it ONE bit! I'm sure a bumper was only about £240 all in if not cheaper?? You won't get any quality respray for that price. Plus, could you live with a bumper which is stonechipped to death? How long for? I know I couldn't!
Gap insurance could be a good idea, just get it elsewhere, there's a site where they make it well cheaper compared to dealers, do a search on here, can't remember the address.