The best advice is to get the best instructor you can and just practice practice.....
It is very important to have good practicing habits, like using the metronome and starting any drill at low BPM and then working your way up.
Just had a drive in an SL55, I can't for the life of me imagine how the suits at Merc let AMG get away with that exhaust note, so unrefined, so sexy...:twisted:
I see you don't like Audi -and generally I share your opinion- but the new RS6 sounds perfect for your needs, and I'm sure with 570 HP it will devour the Porche any time any day.