line of vehicles. If you really need 4 comfortable seats, S7 or S8. The RS5 is too small. Sounds like you don't want something as big as the Q8 chassis.
Yes, Mercedes has their AMGs and BMW has their Ms, but I've found that on a dollar-for-dollar basis, I've gotten much better performance out of the S and RS vehicles I've owned.
This is all assuming you don't want to go with a Tesla S Plaid or a Lucid Sapphire. Those cars scream in ways that ICE vehicles will never achieve.