Although people here will be a little too harsh about the prospects of a transfer, I'd advise this:
1. If you do very, very well, you can probably transfer to a very good school. I'd say that if you're the type who will be in the top 10% in your class, you can probably transfer into many 2T schools. If you are in the top 5% to #1 in the class, you stand a shot at going to a T1 school.
2. That is worlds away from saying you have a good shot to transfer into a SPECIFIC school. It's entirely possible that regardless of how well you do, that you cannot transfer into a SPECIFIC school that you are targeting. Better to have a more general goal of transferring into something in T2 or T1. However, not particularly adviseable to, say, set a goal of transferring into Northwestern, specifically.
3. The other distinct possibility is that you won't be in the top 10% of your 1L class. I know that sounds harsh. We're all highly intelligent people here. However, pretty much everybody who enters 1L thinks they'll be in the top 10% of the class. 90% of us are wrong. This isn't like undergrad. All the doofuses who were content with a C, and overjoyed if they managed a B are gone. They had enough of school and they're probably not coming back for any more. Even the worst-regarded ABA law schools in the country have a student population of higher caliber than what you saw in undergrad. Even the very worst have some seriously intelligent and motivated students in there.
So, with that having been said, I agree with the folks who say do NOT attend a Law school that you would not be able to live with if you had to attend it for all 3 years. The vast majority of people who enter 1L and graduate will do it all at one school. Transferring is not impossible, but it's problematic. Plus, strange things happen. People get married, they get jobs, they have babies, whatever. Unless you live like a monk, you're going to experience a lot of life, and sometimes life takes you where it wants to take you, not where you envisioned you would go.
Best of luck. I considered ONU, but it was a little far for me. Cost of living there should be really cheap. It's basically in the middle of a bunch of cornfields. Seems like a very nice school.