This screams LCI E88 135i with DCT to me.
N55 engine which is gorgeous and fairly reliable, slightly newer but still hydraulic steering rack.
Not sure I’d go for an F3x platform and certainly not a diesel 4 series convertible.
The torque of the diesel will get old quick, and you’ll soon find it drives like a boat - the torque wears off quickly.
If I wanted that kind of thing, the M240i has dropped enough in price to be an option an option as well. I'll go and look at some, I do need to squeeze in (occasionally) the older teenage kids, hence probably relegated to the lardier/larger cars.
I expected to hate the 435d as it is literally does not work on paper in anyway, so I was surprised on driving one for 4 days that it made a pretty quick more relaxed capable tourer and even had some fun with the xDrive in getting all that torque down whilst sliding sideways but keeping maximum forward momentum..
It's probably me, I've owned a few cars that people slate for handling, only to find it's not so bad in practice since most people are full of hot air and won't push their cars past 8/10ths so if I am comfortable with it on the limit, that's often enough to make up for the defecit.. hell, in an F25 X3 35d I use to see off quite a few cars in the twisties because most people are caught in a bubble of paper specs and run out of bravado the moment it gets tricky..
But, I hear you all, and my brain is kicking in with the diesel part of convertible.. I've also found some cheaper new E-Class W213's I will go and take a peek, definitely not a sporty option, but interested to see how they drive.. I've only driven an older C207 E-Class convertible (350d) which was a diesel, but you'd never know, that was pure relaxation, you could have the roof down in 5C no problems, but it was very much the opposite of any BMW at the time, and I keep coming back to BMW as I like the blend of sportiness/refinement/engineering.
