Chaps, I wouldn't be too quick to dismiss solid discs, you have to be putting some serious energy into a 32 or 34mm disc to get it to warp. This is the problem with the 345mm R32 its diameter is promising for track use but at 30mm wide its not track hardy but with it being 345mm in diameter it can generate some heat especially with fast road/race pads.
I cant remember the formula but you need something like 35-45% more energy to get the same temperature increase from a (for example) 28mm wide disc as into a 32mm.
There are some 32mm wide grooved 350mm discs I've been using with 996Turbo calipers with good results......
Price..... inside of 200 quid per pair!!!!
I suppose it all depends on how much of a purist you are and whether the 20% weight saving on the disc means more than having 4-600 quid left in your pocket for a remap or an exhaust.....
I read somewhere F1 Discs are about 38mm wide to deal with the heat (Max 300mm in diameter though
)
I'd be p1ssed off if I toasted a pair of Alcons on a track day