Depends on where
Newbie- Not to dispute earlier posts , the first thing you want to take into account is how you plan to use the boat, and where.Climate, weather, water depths and sea conditions in whatever area you hope to sail in and should be given some consideration before you go shopping.Also your intentions: are you aiming for leisurely cruising for extended periods, or mostly day-sailing with the occasional week-end on board, some racing or maybe, ultimately, a boat you can circumnavigate in ?The design of any boat involves a number of compromises: some designs are sharply focused in one direction, and thus sacrifice in other areas- for example a design that's biased toward the racer/cruiser may be faster and able to sail closer to the wind than a somewhat tubbier, heavier boat that is biased toward cruising, but the cruiser will have more room & storeage space belowdecks, larger tanks for fuel & water,etc etc. Many of the boats mentioned are production boats that try to offer as much of everything as they can, within their targeted price range, to have a broader appeal & usefulness (and greater sales volume too): as a rule, the designers/builders have done a great job and the results are very impressive.You might find it worthwhile to do a little reading first: one book I can recommend is "Your First Sailboat" by Daniel Spurr (International Marine-2004) You mentioned plans to live aboard, so the design that is biased toward cruising is probably better suited to your needs. It'll be a bit slower(usually) but more roomy & comfortable.Be prepared for an attack of "two-footitis" : it's a very common condition, especially with first-time buyers. The symptoms? You buy a boat, live with it for a while, then regret that you didn't buy one that's two feet longer.