Motorway glider 200km/h – which engine is ideal?

I prefer to drive 180-200km/h, almost –permanent left, on the highway. I feel that this is safer and more relaxed than 140-160 and constantly changing lanes. Faster ones are of course allowed to pass. But some engines start drinking, and some cars become loud and uncomfortable when it comes to 200km/h. If I could choose a car for the purpose, then it would probably be the no-buy Porsche Panamera 4S V8 diesel with 421hp. But that’s just like the Audi SQ7, out of my budget (40-60k). What could fit (>300hp, Eur6 mandatory): Porsche Cayenne E2 with 385hp V8 Diesel, Audi A6 BiTu with 313/326hp, BMW F01/F10/F11/G10/G11/G30/G31, i.e. the new and old 5er+7er, i.e. 35d/40d or even 50d. Has anyone experienced what these vehicles need on average on the AB and how comfortable it is to travel? Or maybe a petrol engine? The 2.0l-EA888 with 252hp in my Ex-A4 was emotionless, but really great. I also find Volvo T8 Hybrid (V60,XC60,V90) chic and interesting, unfortunately scarce used market and new long delivery times. I would also prefer (1-4 years) used. A BMW series six (currently B58) in the 5th is another alternative, or an Audi S4. I also like to drive a V8 once. Audi S6? Great engine, with potential after the warranty period on RS6 performance. Speaking of great engine, AMG 4.0l V 8 – in the C63 already used affordable. But are the running costs (at about 16tkm/year) still in relation to driving fun? What is your egg-legging wool-milk sow? Fast, practical, comfortable, sporty, economical, emotional, affordable…