There's the Truk Odyssey...and then there's everything else.
I spent a week at the Blue Lagoon, and two weeks on the Odyssey. People love to say that it costs a lot more, but it doesn't. Not going to repeat the math here - I've posted it many times before - but when you add everything up on an "apples to apples" comparison, it's not much more than a few dollars extra...and FAR superior. (Unless you want trimix or simply don't want a liveaboard.)
PS - A shop owner who "prefers land based" but has "never done a liveaboard, so has made up his mind" is really...um...uh...Well, I'm sure he's a great guy, but he'd be the last shop-owner in the world I'd go on a dive trip with, much less allow to plan one.
When are you looking to go? The Odyssey tends to book YEARS in advance if you want the whole boat.