I've said it before and I'll say it again, if it's a special model with a unique colour (Pure Grey) get it! I know too many people that regretted not getting the Deep Pearl Blue in the mk5 R32, on down the line.
Every car will have issues even Rolls Royce and Bentleys, I wouldn't get too hung up on them especially with a car that will most likely still have some manufacturer warranty. I have a sunroof on my GTI and use it everyday, it's just easier to be a dictator with a sunroof.
I also have 19's and no DCC and never found it uncomfortable.
From memory later TCR's had the Akrapovic Exhaust and rear view camera as standard, which I'd have a think about if your budget to stretch that bit extra since titanium exhausts are horrendously expensive.
Would you be after a 3 door or a 5 door version?