Thanks for the good advice guys!
Deco, I get what you mean, the thought of building a proper balls out NA is an attractive idea, but when there is a turbo variant already it seems a little pointless. Its something I'd love to do to my EK4, which is waiting for me back in Scotland.
adisco, A rev 3 would be great, but thats by no means a dealbreaker, there are so many more to choose from when looking at rev 2's as well. I'll probably be upgrading the brakes and suspension first of all anyway, looking for a well kept car.
With the Supra there was BPU (basic performance upgrade) essentially stage 1 getting the most out of the stock turbo system, are there any guides etc outlining the mods required for that on an MR2?