The rover 75 is to heavy and the bmw lump is not that good or easy to tune. I have a mg zs180 which is slowly being tweaked and added to on track days - I have fun and it's not that embarrassing. I met the mg cockshoot race cars at donington last July and the knowledge and help was superb and what it came across to me was just spend a little to start as your going to write it off as your experience is low. Then just buy other people's racers cars as they move up through the ranks it's the most cost effective route - the mg race series has excellent races for the Zr and zs plus mgf where you can tune the old l series lump cheaply and put on the slip dif from the brm or 620ti and its a pocket rocket. So moral of story just get racing and not get bogged down in car specs and parts - enjoy Alan