Jack's diving locker - advanced dives only. Talk to them first about how you want to dive and i'm sure they can accommodate you.
i've done a number with them (not GUE), on the smaller boats and they can usually get something together that can work for you.
Lots of interesting sites and they can give you profiles for planning purposes.
The shore diving is good too. The AKA "rip off reef" (Honokohau) to the left of the Kialua marina near the costco, actually provides some good diving and is easy to enter and exit for shore diving. They can let you know of other good places to go outside of the usual "place of refuge" in Kona (another popular site)
A-bay up north in kohala is entertaining as well (left/south side) there is a local dive boat operating out of there and will head out with 2 on board, you can do your own plan and be DM free or DM followed, with local knowledge. Again talk to them first, they are based on the beach directly in front of the Marriott at A-Bay in kohala. Sorry don't remember the name of the operation off hand (call the Marriott in Kohala and they can tell you). there are a lot of interesting sites north of the hilton complex.
call them 808 329-7585 - Jacks Diving locker.
the shop is staffed with the boat DM's
(manta PM dive is good, your on a bigger boat, which you want to be heading over west point in the afternoon, and keller is entertaining if a bit "practiced", we had 16 manta that night and large moray eel swim though my legs while on the bottom)
For the others - I've heard good things about Big island Divers, but have not dived with them. Jacks does a ton of tourists but is well equipped and willing to accommodate divers on the advanced trips or private charters.
I was there 5 weeks last year and all of a sudden we had Baby sitters from the shop which was great.
depending where your staying i can give you some good places to go top side as well (quinns by the sea is a great local hang out for steaks/fish at medium prices).