Really depends on your budget. I always enjoy the extra room you get with a bigger boat, but that also comes with other issues as well (increased towing weight and fuel burn to name a couple).
We have a 2012 210 SE with twin supercharged motors (430Hp). She'll do 50-51 all day and has tons of room, rides nice and doesn't porpoise like some of the smaller boats.
If you like what you have and simply want to move up to a newer version of the same, check out the speedster/sportster lineup from 2008 on up. The supercharged versions have 215-255 HP versus 155 for the non supercharged versions. A rebuild should have been done on anything in those model years and if not done, then factor in $450 for a supercharger rebuild and use it when negotiating. The ceramic washer 4tecs were 2006 and earlier, but the boat motors run a year behind, so you may see them in 2007s as well, which I why I recommended 2008 or newer. There were some NA filled valves in earlier years as well, but I forget which years those came out?? Maybe 2008/09. Maybe someone else can clarify.
If you have the time, I'd go look at a few different years and models and see what you like and don't like and try to narrow your search down that way. With the boating season coming to and end for many and slowing down for others, you have plenty of time to make your decision.