I'm thinking of upgrading from my current Caterham - 1.6, 8 valve VX. There are 3 cars on my shortlist, each with a different engine; Raceline Zetec-R 2l 160, Zetec Dunnell 165, K series 1600. I'd appreciate your thoughts/advice on the best choice and the pros & cons of each. I anticipate road use only, of a fairly spirited nature. Thanks