Hi,
I'm not going to start quoting lots of different options on whats best or not, from my experience, buying the quality product and spending a bit extra on it will save you money in the long run as it should last you longer and will be of a better spec etc.
ie :- get a good fast servo upfront, not a cheap tacky one as it will not be up to much.
my best advice will be to get up to the stotfold model car club on Sunday the 20th of feb as there will be a large race meet with some top drivers attending and they will give you all the advice you can get.
www.stotfoldmcc.co.uk
Huckster