I always go back to the Pablo Casals recordings of the Suites (which I think have just recently been re-remastered). They're classic if not definitive.
Thomas Demenga — who seems a relatively new master — has also recorded the Suites for ECM, but they've been spread across a fair amount of different discs. Still, great production values, and Demenga's sound is nice — though he does tend to take some tempi more "up" than Casals.
I've never been able to get with either of Yo Yo Ma's recordings of the Suites. (He recorded them, in entirety, for Sony twice, I believe.) Technically immaculate, but something oh-so Wyntonesque about those sides ...