Kev,
As already said mate don't let anybody else decide for you on whether to go for a TT or NA, test drive both then decide.
Although, I too had reservations over the TT due to reliability but these were toally unfounded. The TT is definitely one of the most reliable supercars money can buy and you really shouldn't worry about things going wrong. If the car has been looked after (as with all cars) then it'll be perfectly reliable. I test drove both the NA and TT and I'm glad to say I went with the TT, if you have the purchase budget for the TT then you should seriously consider that.
Harps,
That seems a tad pricey for an NA Aerotop (Not TT) if that's what you're on about. As for the Auto concern then i'm afraid all Aerotops are Auto, well RHD ones anyway.