IMO beige is the classiest look. MR / beige looks good, as does Black / beige. I have black/ sand interior currently and it still looks great - but looking for a change...
No idea on the re-sale, but my heuristical takes:
Black - too hot for some areas
FR - I like it, but may be too boy-racerish for some tastes on re-sale
Beige is a more neutral choice
Just thinking of something not so witty
///M3 E92 '09 Jerez Black | 6MT | Ext Fox Red | Tech | Prem | 19s |Heated Seats | iPod |Smartphone | Euro Deliv June 09
Sold: 540iT / 530i / 323i