I graduated from Roger Williams in 2006. I graduated in the top 5% of my class, was a member of the Honors Program and was on the school's Law Review. I received a fantastic legal education. In fact, although RWU is perceived by many as one of the worst law schools in the country, the quality of the education that you would recieve at RWU would rival or surpass the qualtiy of the education that you would get at the other schools you listed.
With that said, if I were in your position, without any hesitation, I would choose Nova. GO TO THE HIGHEST RANKED SCHOOL THAT ACCEPTS YOU. Even if you prove to be a terrible law student, struggle to pass the bar exam and become a mediocre lawyer, there will be opportunities for you. I was in a similar position and had similar questions when I was applying to law schools in 2003. I accepted a scholarship to RWU. It was a (big) mistake. If you intend to go into private practice after graduation, the full ride to RWU, which is worth about 90k, is not worth the lost opportunity. In all likelihood, if you get a job, you will not earn as much money after graduation with the RWU degree. I currently have an appellate clerkship in a state court. There are clerks here from "Tier 1," "Tier 3" and "Tier 4" schools. ALL of the clerks from Tier 1 schools who elected to go into private practice, many of whom were not ranked in the top 50% of their law school class, got jobs paying 100k or greater with larger firms. The majority of the tier 3 and 4 clerks, who were, for the most part, ranked in the top 10% of their graduating classes, were shunned by the larger firms and are looking at salaries of 60-70k at smaller firms (which often expect that you will work big firm hours). Opportunity will be no different as a Suffolk graduate unless you finish at the very top of the class.
When I was a 2L, I applied for summer associate positions with the larger Providence firms. One student from my class got a position and the vast majority of 1Ls and 2Ls ultimately did unpaid internships or non-legal work during the summer. At highly regarded schools, you have a realistic chance at obtaining a summer clerk position where you would earn about 30-40k during each summer break. Why is this the case? It's because many attorneys will assume that you are less intelligent because you went to RWU, a law school that many attorneys have never heard of. Midsize firms are just as elitist. Even if you need to take out loans to go to a Tier 1, if you live frugally, this summer income could offset a large portion of your tuition debt.
You should ask RWU for the free ride PLUS 100K.
How exactly do you intend to open your own "medium size" firm?