For as you say, Messing about, That's way over, You can save £100 straight off buy swapping the combo for a Max8 as you would miss nothing, I'd drop them Lipo's as well as that sort of money for that spec is silly, Can get a couple sets of Zeee's for that, Or GoldBat which seem to be getting a good name.
The car is gonna be the biggest bone of contention, I think it is just a cash grab by Horizon and Arrma, Some fancy alloy a race car it dose not make, I wouldn't spend 400 quid on that when 430 gets you an Associated, I know nothing about the race side of it, But I wouldn't spend £400 on a kit to bash about, I'd get the Kronos XTR or Hyper SSE and save £100.
To be honest I would just buy This, In the current market this is a bargain, Pretty much the Max8 combo with a radio set and buggy kit thrown in for £180.