Alot of good thought/ideas here so far.......so here's mine....
Slicks, tubes and rims are too expensive to keep trying/swapping around. Take the time and some serious thought about where you want to be in the future. If you're gonna change gears at some point, i'd just get what you'll realy need down the road. I completely understand using the short tire for now....long story, but i actully ran a 22" tire on a 13" rim before on a brand X because it had a 2.73 gear......lol.
What i'm getting at is, a 9" tire can run some serious numbers and whatever diameter works for fitment and looks, be it a 14" or 15" rim, 26"/27"/28" tire, i would just do it once and be done with it.