If you want to do it right get the original and by far the best, carve board 8 ply by carve designs. I live by some nice hills and nothing is better then taking that thing down some steep ones. If you do not have access to big hills, want to ride less steep ones, or dont have the cash; go with the Makai Drop Board by Gravity. I got both and they are so much fun. Whatever you decide, take your balls out and go crazy.
Personally I prefer Carvers with longer decks, seems a little more stable and surfy. I have one setup with the 42" Carver deck (the Flowmaster) and one with a 36" (Venice), both with the C7/C2 truck combo. I like the 42" setup best. The carving motion is more sweeping with a longer deck.
But I haven't ridden a regular-length skateboard in years- if you're coming from a standard popsicle deck, that may be a factor, results may vary, etc.
I picked up one (knox model w/C7/C2 system) as well a couple weeks ago, when weeks of north east wind here were eliminating any possibility of good surf. I love it as well. I had not skated much for years (still have my old '81 P&P Steve Cabellero w/Indy & Sims) but love the way the carver pumps and carves. No comparison. The only problem I had the first day was I got a little too confident & was not paying attention and put too much weight over the rear wheel rail and had a little "wheel bite" which put me on the ground. It has not happened since, as I am aware of it, but I still may tighten the rear truck.
I do notice a nice "burn" in some of my leg muscles that normally don't get worked by other exercises. It's nice to have even when I may have only a spare 10 minutes or so to just grab it, an go up and down the street a few times, & do some front side and back side turns.
just came in from a pretty fun & productive session! just up & down the street in front of my house a few times...starting to get the hang of the pumping thing & back foot placement (almost right over the rear truck, maybe a hair behind)...definitely helps to have some momentum w/ these things to get them going! if i had it, i could keep it & even speed up a bit, but getting it back once i burned it off somehow (usually a long, drawn out u-turn) was mostly impossible...maybe something i'll figure out w/ more time on the board?