Rims are always just an opinion thing. Some people don't really care much for them and some people go nuts with them. If I could afford or get a deal on 20 inches, I would do it.
In my opinion, I think the touring rims look way better than the base ones. I think the finish is also a little better. Plus, the Michelins look and perform much better than the Goodyears.
Also, fromt he outside, the rims, and the luggage rack (which I have) make the base look just like the touring.