Personally, I would go to Rutgers unless they offered you money that made it worth attending. A friend of mine has a scholarship that covers 75% of tuition, and she has her share of complaints. I doubt that MSU name recognition offers you an overwhelming advantage in the international arena, at least not one that is offset by attending school in the northeast. Their rankings will go up, but remember that everyone plays the rankings game, and MSU College of Law is still a private institution. It took Dickenson a while to crawl to its current ranking.
Also, your interests may very well change when you start law school. I started wanting to practice international law and I'm now a criminal defense convert.
That aside, while I have never visited Newark, I did live in East Lansing for four years. I really enjoyed it. And while I do not know what effort the College of Law makes with respect to international practice, MSU has an extensive international studies program. In absolute numbers, they send the most students abroad for study, I believe, and as part of my undergrad program I interned with the UN in Thailand. So lots of opportunities at the university level.