This question will get you 287,639 different opinions... you need to ask yourself a few questions first.
- What do the other local racers run? (parts support & set up help on race days).
- What parts will my local hobby shop have in stock? (prevents having to order online, or wait for an urgently needed part).
- How much money do I want to spend?
- Are you looking a few rigs in particular? (it's easier to get pros / cons of a few different models versus just asking for a general recommendation.