White letters out or in!?
I vote for "IN"
I recently grappled wit this and ended up going with letters out...they look fine but I came across a surprisingly cool suspension-modded first gen T-Bird (yeah, I know...trust me, it was tasteful and sharp_) that was running some minilite style wheels...This guy had the good sense to mount the letters in and looked sharp as hell.
Sometimes doing something different from everyone else is all that it takes to make your car look fresh and unique.
I regret having the letters out. :D