I am firmly of the belief that the standard callipers are up to the job (especially on an n/a car) I would go for ali bells and get the best discs you can afford - AP3000 are very good and cost a bit more (run them on the race car). AP5000s are OK I had them on the Bemani with decent brake fluid and pagids job done!
Although I do tend to agree with Jamie, I’ve decided to go for the Lotus Sport kit. Reasoned that it has taken be a couple of years to go through the original disks so it may be another couple before there was a convenient opportunity to upgrade again, so might as well go for the best option just now.
Figured that if there are any problems there may be some recourse to Lotus, where as if I went with the other options I’d be on my own.