needs new tyres

Hi all

I'm looking to change my daily driver, currently drive a 911 c2s cab daily;
8 - 10k miles per year / all weather (UK based)
Weekday motorway miles, weekend, enthusiastic driving.

I'm looking at 2014 / 2015 cars with 20k - 30k miles

Anything I really need to look our for in terms of known issues / faults
Any must have / avoid options
I've lightly modified all previous cars (M5/M3/R8/911's) and like the idea / results of mapping a w231 (non performance) - Spoke to the guys @ DMS & they sound positive on the results from the w231, my concern will be tractions & usability with more torque
I've been reading about aftermarket steering wheel upgrades, also looking for ideas, vendors & experience

I'm looking for real world advice & feedback from SL 63 drivers & anyone that's moved across from Porsche to Mercedes or back the other way

Many thanks in advance

Tyrone