I believe Eric from Speedy Tertle has moved on (the good way, not died). I've dived with Tertle before and found them adequate. If he's gone, the Russian owners can speak English, so they're an option. As to boat v. beach diving, I find the boat sites much more interesting (except for the Grotto with it's 100-plus step and tricky entry-exit; but worth it all). If you get a chance, make the 45 minute run to Tinian (Flemming Wall is my favorite). There are 43 shops on Saipan. 41 are Japanese, 1 is Korean, and 1 is Russian (Tertle). If Tertle doesn't give you any love, you could try Seashore. I know for a fact that two of the guides speak some-passable English. They have an English price list on their website, so if you mail them in BASIC English, you'll probably get a response. I always dive with them and find them friendly, accomodating, safe and service-oriented.  If you're fully equiped, you might try the former owner of Tertle/Stingray divers who is on this board. He seems to do some pretty exciting profiles, but apparently charges a bit more. Check the board for former Saipan posts (there aren't THAT many). I'll be there myself in 12 short days...I'm counting every one!