Gears & Axles - Which wheel can I run if I get a slightly narrowed rearend?

What benefits would this get for me, and negatives?

less weight for one, not sure how much/inch. and a much better looking wheel as far as the dish goes, which is the number 1 reason i ordered mine that way and will do so again with the next one. fyi.......i just posted a brand new one in the for sale section if you're interested. but that's not why i'm responding. no negatives that i know of. plenty have done it.

later,
Dave