You have to also consider that 15 - 20yrs on 944 turbos and S2's are showing signs of rust along the sill and bottom of the wings. They corrode from the inside out so you can check all you like externally when looking at a car but you wont really know what the true condition is under the skin. My car is a daily driver and the bodywork looks as fresh as it did the day it rolled off the production line - especially since it had a full all-over machine polish to restore it from Guards Pink to Guards Red - however i'm into my 5th year of daily driving and my car is now showing signs of rust along the passenger sill. I don't like the idea of getting the affected areas patched up so am now considering a full respray and two new wings and sills - probably starring down the barrel of £4k. So if you factor this into the cost of the car a 944T is not such a bargain - still alot of performance car for relatively little money, but not quite the deal you thought you were going to get.
I don't want to put you off, but you need to go into this with your eyes open. The only 993 i'd trade my car in for is either a TT (just love the boost) or one that has been breathed on by 9M with those billet cylinder heads.
Other than that the car has been 100% reliable, has cost me relatively little money to run (mods asside), goes like absolute stink, is lushious to drive and though the engine note is not quite as spine tingly as a 993's, I actually don't think it is that bad - it's a very smooth 4 cylinder purr with nice transmission whine - I find it quite inspiring.