I like the Red Bull idea.. red, blue, silver and yellow... what more could you ask for?
I'm getting a runner together too and have found that serious BB spares are a pretty rare find... OE wheels are a problem and expensive too, so if you haven't got a chassis yet, get one with good wheels... Dyna Blaster wheels fit apparently and they would be good for the red bull scheme 'cos they are silver, but the steering parts may have to be modified for DB parts.. OE shells are not cheap, but if you want a runner check out the Kamtec Lexan shells...