I've got the brushed alu combined with the saddle brown leather, I think it looks amazing

it adds some refinement rather than the wood trim that makes it feel like an old man's car (sorry for those who dig wood trim, I just don't like it...)
the alu scratches easily, but if you pay some attention, you should be fine
so far, only 1 scratch near the seat-belt lock at the driver side after 25.000kms of everyday use.
just make sure that you don't have any other keys or chain ring hanging from the key fob as this rattles and scratches the trim around the slot in the dash... or get keyless entry