not many people reply on here... firstly i would go with the supra TT01-D chassis as it's already a little setup for drifting however i advise you to buy different tyres for it... tamiya drift tyres suck balls...
i use HPI T-DRIFT tyres they are pretty nice... i also have a tt01... no.1 thing to get would be an alloy drive shaft (helps alot) these are usually pretty cheap.
then you should be pretty setup... the body that comes with it is clear so you paint it yourself (paint the inside) paint's pretty cheap and easy
basically if you buy that kit apart from obvious stuff like radio etc... id suggest

alloy drive shaft
better tyres
since it comes with full bearings etc... it's pretty much set up enough to only need those items... if you wanna get fancy theres heaps of parts like carbon fibre top deck... carbon fibre shock stiffner's...
hope this helps... any questions just ask... im no expert but any helps better than no help right