RE: Time to replace the Mark.
Pete,
As you may know (or may not), I have been on a similar quest. I have been looking for a Mark replacement for the last year, and have driven most every car on your list (including the STi). Thus far, the best car I have found, and which leads my list is easily the Jaguar XJR. (may be buying a Carnival red on Oatmeal one this weekend!!) I know you don't want used, but you can get a year or two old Jag for what you'd pay new for one of those other cars, and it's head and shoulders above them. To me, it's like a 4 door Mark...but better. It's a sedan, but the way the front seats and the tranny tunnel is reminds me of the Mark. You you step inside, the Connelly leather smells like you've just entered a leather store. Kick off your shoes, and run your feet through the wool carpet. A small forest was killed to provide for the abundant burled walnut dash. The walnust dash, by the way, is beautiful. And goes from drivers door to drivers door. You get a real sense of luxury when you get in, which simply isn't the case for ANY domestic luxury car. The Harmon Kardon stereo is the 2nd best I've ever heard, being topped only by the Mark Levinson stereo in the Lexus. The auto transmission is the same transmission that Mercedes puts in their AMG cars. The engine is a supercharged 4.0 DOHC engine, and puts down 370HP and 390TQ at a mere 3600RPM. Of special note is that over 80% of this TQ is available from as low as 1500RPM. The car blasts from 0-60 in 5.2-5.5, and does the quarter mile in 13.5-13.7 In a casual street race, you certainly could suprise an unsuspecting Vette owner. Car has dynamic vehicle stability control too. ABS, heated seats front and back..all the good stuff. 18" wheels are standard. And the ride? Super quiet and comfortable..almost Lexus like, but not quite. It's close though. Here's a quick article to read over.
http://popularmechanics.com/automot.../comparison_test_13_quickest_cars/print.phtml
And if you don't like the Jag, my next car on the list is a Lexus GS 400. Very, very nice car. If it wasn't for the extra 70HP and 70TQ, this baby would be in my driveway. Stupid quiet. I mean QUIET!!! And it has all the power down low the Mark lacked. A great car. Drop me a line if you want any of my other reviews....