Yeah it wud definitely be a massive plus on a re-selling point of view...but say you went for a 6 and unless you were going for a R I don't think the recaro's were available option so I wud seriously be looking into keeping your current recaro's and put them in the new car and sell the std seats the new car comes with...
I know this will mean getting your hands on a 2nd interior but they come up on flee bay regularly...
The optional recaro's are a stunning seat and I don't think I personally cud part with them before exhausting all other avenues...
Food for thort if in the future you head that way.....

Anyway enjoy the forum and soak up the endless sarcasm and banter...