I've never driven an N/A, but then I wouldn't want to either - I have a feeling it would be a big let-down. Basically, to my mind, it would be a car that looks like a sports car, but doesn't go like one. I'm with you on the automatic gearbox thing, too - proper drivers have proper gearboxes, not go-karts, you know?
So, for what it's worth, I would personaly go for a twin turbo manual (like I have...). Also, I'm not a big fan of the aero-top, but if that's your thing...
As for the Jap vs UK thing, I guess that's got quite a lot to do with what's available at the time and how much you're willing to search/have to spend. Either way, it should be a lot of fun!
Welcome, by the way.