On road trips my friends in Caymans (various types) definitely do seem to have more fun in the very twisty / narrow bits, but as soon as the road ever opens up they become more like annoying moving road blocks.
I don't really use my 3RSs for normal road driving, not boring as such, just not the right environment. If I owned a 458 I don't think I'd swap it for a 3RS, different cars for different days. A GT3 Touring, maybe...
Gotta have the big wing and the touring has same suspension as a GT3 so for me it’s gotta be the big wing car all day long. Guess once one becomes a GT3 owner then track days become a regular event, I do remember when I had my 911 I must have done 15-20 track days in it as even the regular cooking model was so good on track and been a Porsche it was so reliable even with a chocolate engine.
I’m not sure what gap in your collection a boxster spyder fills. Granted if you want a Porsche then that’s a really good option, but for road legal top down thrills you’ve got the S2000. If you want a coupe then the Vantage makes a good noise and goes pretty quickly too by all accounts.
This is way out of left field and it’s not a flat 6, but it is purple and has pop up headlights!
https://www.pistonheads.com/buy/listing/12017136
Not for me and honestly I don’t think a Spyder is either and if I did get a Spyder like you say it would kind of render the S2000 useless though the S2000 has a better roof. Cayman R really favourite just guess I’m considering the PDK when I had one for a weekend it was like ten years ago and I can’t even remember if it was a manual or PDK.