Re: What car should I get next? 166 or GTV?
Don't think there's much point in you changing to a 166. They don't look as nice, are bigger and less sporty than a 156, although the interior is nicer. But you've got your perfect spec in a 156, so why not stick with it? If you want something a bit quicker, you'd be better off trying to get a few more bhp from your 156 V6 than upgrade to a 3.0 166. It would only be noticable quicker at high speeds anyway, not so much off the line.
Get sports springs and dampers for your 156, good exhaust, and maybe get the head ported and polished, and a remap is a must. You could probably see 100bhp/litre staying N/A if you invest a bit in the car.
But if you can afford the im-practicalilty of the GTV 3.0, then get it, but you might be flogging a perfectly good 156 V6 and buying a lemon GTV at that sort of money. Maybe sticking with what you have for the moment is the best idea..