Another vote for Gandi from me for domain registrar. A lot of people don't seem to like the new web UI, but I'm satisfied with their offerings.
At the time I chose Gandi for the 2 factor auth, and because it was a European company, but in the meantime there is plenty of other registrars offering the same.
Just curious, but who does that? I can only afford to renew a small handful of domains, never mind 200+. I presume they are all monetized in some way?