Mi4LP(pro or race version?)

[stnorm]

having only raced buggies before I now wish to have a go at 1/1 track racing and the Mi4LP stands out for me. Trouble is which version to go for. I realise the 'pro' is higher spec but apart from the CF chassis and more adjustable shocks is it worth me paying out the extra £120 ish for it. are there other better parts in the pro kit and if I say, went for the cheaper version could it be upgraded bit by bit? Is the race version £120 slower out of the box?