...everybody's opinion of what is firm or to firm can only be individual to them...
True.
Some people on the Audi forum bought Sline cars and found them too firm. Others deleted the Sport Suspension and find the car too soft. It is a personal thing. Our Audi dealer said the Sport Suspension was comfortable. We had it for a 24h test drive and did not agree. My wife had a Mk5 Match and wanted similar comfort levels. She did not want a car as firm as my Mk6.
So when do you have to make a decision? Big difference between 12k and 20k + mileage? Can you wait to see what happens work wise before deciding? I found the GTI fantastic, and I'm sure the GTD would be too...
Just paid off my car and it is good for work. So I'm gonna hang on for the Mk8. The GTD has more smiles per gallon

Though there probably would not be much in it if I was doing a lot of small journeys. As for work - if I don't get pushed, I will probably jump in a couple of years.
And intrigued to hear your observations on quattro, not that I'll ever be pushing hard enough to have any issues myself!
As we live in a rural location I did some research into buying a Quattro for my wife. Like many people I though it would be safer for her in the winter. What I discovered surprised me. Four Wheel Drive is definitely safer if you are in a tractor/SUV in a wet field with an unstable load such as a slurry tanker/stock trailer. Engine braking on all 4 wheels is really useful. I am from a farming background and have experienced this first hand.
What I discovered was - on snow and ice, in an emergency, a 4WD car will stop and corner the same as any other car on similar tyres. All things being equal - an 4WD SUV will take longer to stop and not corner as well as a car in similar conditions, as they are much heavier. A lot of 4x4 drivers discovered this last winter. My friend wanted his car serviced in March but his local garage was full of SUVs that were able to drive up icy hills, but could not safely drive back down them.
Notice how every winter Audi have adverts showing poor weather and a Quattro. Also notice how they say something like, 'better in all conditions.' They never use the word safer! Yet the Audi forum is full of people saying how safe Quattro is. I don't argue with them any more. I just ask them to show me the independent evidence. If what they are saying is true, then surely youtube would have lots of videos showing this. Also, there would be loads of independent articles written about the safety advantages of Quattro. There are NONE that I can find. Yet I can find videos and articles showing how winter tyres offer much better braking and cornering on snow and ice. You can google 'all wheel drive myths'. If you want to read some of the articles for yourself.
Both our cars are fitted with winter tyres. I have driven up and down mountains in snow with winter tyres in a front wheel drive, 170hp, automatic Golf. I know my wife won't get stuck or crash going down a hill because the car has no grip.
Having said all that, the S3 definitely needs Quattro. It is a great performance feature for all conditions