I may have a cheap compromise for you to consider. I'm not trying to sell mine, but I have a nearly three year old Mercedes 220 Coupe with AMG suspension and variable rate steering.
It handles absolutely superbly and has slightly better steering than my twelve year old, Porsche maintained Boxster, it's miles quieter, it has four comfortable seats, the rears fold down to make a huge boot huger and so on. Because it has 300 lbs/ft of torque at 1400 rpm, it's as fast most of the time as my Boxster that has 187 lbs/ft at 4,500.
The only reason you can't corner quite as quickly is that the ride is better.
My Boxster is twelve years and 64,000 miles old and has just had a major service. Everything that can be was done and that included replacing crossover pipes, so a £2000 bill. Therefore I considered buying a newish one until I realised I'd have to spend £35,000 plus! I've decided to keep the Boxster and I traded the C180 I had and didn't terribly like for this Coupe which is incredibly good, albeit sounding like a Stagecoach bus. It was under £18,000, so maybe one might appeal to you and enable you to keep the two cars you have.
As my chum with a 964 has discovered, most modern 2L diesel estate cars p155 off into the distance by the time his is up into the power band, or he has to change gear endlessly. My Boxster is torquier than his, otherwise as fast and a lot more economical.
