GEMS ecu's will do anything and everything you would possibly want for about the same price as the lesser spec'd second hand T6 = dont buy used electronics if you can help it.

it all depends on your range, there are the budget spec units - omex, DTA etc etc from like £500-£1000, then the £1200 and up - if your in the latter then there is only one option for you for the money

http://www.gems.co.uk/?content=pages&id=em36