Clintonville
I live in Clintonville (have all of my life), and love it. I grew up in a house one street over from E.N. Broadway, and now live more south in a big brick house practically right on High Street. I like the 1920's era houses, and their is a true sense of belonging to a neighborhood here. Also - I think that you are right, Clintonville is an up and coming neighborhood. There are plans to develop High Street and add more restaurants, shopping, etc. Property values have increased by over 50% in this area since I bought my house 7 years ago.
I'm thinking about moving, but only to have more land & start an organic farm. I'd have to find a very cool property to make it worth it though.
I'm not so crazy about Upper Arlington either. The schools are good there, though. Grandview I really like & you can find affordable houses there if you look. Grandnview is actually a seperate city, and has its own school system. Columbus public schools aren't great - I went to Catholic schools. If private schools are an option, there are quite a few in Clintonville.
Good luck!
my house! .