Perhaps I can offer some opinions with my research for an upcoming trip to Truk in Sept.
Everyone's opinion may vary, but I've learned to go into every trip with some expectation on services, though a complete open-mindedness to underwater expectations.
My wife and I recently had a good experience aboard the Belize Aggressor this past January. (Sorry, I'm not real impressed by Nekton - seemed TOO big with the capacility of 30 divers, and not having Nitrox is a big down point for me with long bottom times. IMO, there are better liveaboards to choose from) We actually really enjoyed the smaller treasures of life we found on the reefs there, but like you, we are now looking with much anticpated excitement to see more action and variety for our trip to Micronesia.
We've been on many liveaboards (and some fairly rough seas - though nothing topped trying to get away from Hurricane Mitch on a boat in the open ocean - a story for a nice surface interval. Mitch made 30ft sea crossings for 36 hours in Cocos look like ripples at times! Ha, LOL!). Anyway, inside of Truk's lagoon, I think you'll find the seas very, very comfortable for you. Short of a complete surprise by Murphy, everything I read and people I spoke with who've been there many times have always enjoyed extremely calm conditions in the lagoon. The water is also very warm, but visibility can be lower than outside the lagoon. Knowing quite a few liveaboards, we chose the Truk Odyssey, and I can say I've never been more impressed with their service, enthusiasm, thoroughness, and willingness to help you enjoy a wonderful experience. In having booked many (10+) liveaboards, I can say that in my experience, some liveaboard customer service reps tend to promise you many things, and their brochures claim certain amenities, but only to find later than that may or may not be in working order or up to the desired expectation. I have had a thoroughly enjoyable experience with Cliff, Tiffany, and his crew with the Truk Odyssey. Their boat seems to have some most of the valued services and the size and comfort levels look to be quite impressive. Many people have come back from their experience with them and are very pleased by Lenny and Cara (I think that's her name), both Captains aboard the Odyssey. Reader polls for whatever value you place on them have consistantly ranked the Odyssey as the top liveaboard, best crew, and value. I'm also impressed with the variety of dive gear potential- single tank aluminums, large capacity steels, dual tanks, NITROX, and 80% deco stage bottles (for those qualitifed) at no extra charge. Plus the safety stop bars with outfitted octos. E-6 processing (which if a boat doesn't have seems archiac nowadays - expect in some remote areas). The charging station and photo tables look to be well layed out. I've seen AED on most boats and haven't checked with Odyssey, though I feel - and my money has booked, that I could not be more pleased in all I have found with the Odyssey.
Depending upon the time you leave, I could give you a report when I return in late Sept?
Hope you found some value in this, feel free to contact me for more details.
Though I've not always been so impressed by some of the Peter Hughes boats, I've heard very good reports on the Peter Hughes PNG experience. Mike Ball has always had a great reputation. I look forward to booking through them and venture into the Coral Sea (if offering) in a few years.
Perhaps someone here can add more to their experience with those destinations?
IMO, for future reference, you should try to gain some more experience and get those 'sea legs' under you. Right now Cocos and Galapagos, and Soccorro may be a bit much - but don't cross-off those destinations, their worth the trip! Ah...so many places, so little film and 1MB cards. 
gofigure?
