The key thing you said was that you are not a peg-dragger which makes a move to the darkside a no-brainer.
I run a 225/55ZR16 Riken Raptor for many of the reasons you mentioned. It is the closest size to the stock 240/50 without being any smaller. The standards books say it is 1.2% larger in circumference. It corrects the speedo error just a bit and I believe that it helps a tad on the gas mileage. You said that you want it to approximate the feel of the Metz, but I sorry to say, you are not going to get that. You will adjust very quickly to the new feel.
