Good selection of quality boats, capable of going anywhere. I've owned a Shannon 28 for past 18 years so I'm obviously biased, but here are a few thoughts for what they are worth. (1) I've sailed my Shannon at 7.2 kts (10.5 SOG in Gulf Stream) in 25-30 kts of wind
for hours at a stretch, doing 305 miles in 50 hours; passed Cape Dory
several times, kept up with a Valiant 37 and Hinckly 35 offshore
for 36 hours, and was more comfortable than friends in an IP 31 in same conditions; not slow in my book, although they like 10 -15 kts, and they only motor
at about 5.5 kts. (2) Access is good and everything can be removed for mods/repair without anything more than popping bungs. (3) Carrying a RIB
would be hard if not impossible; rollup dink fits on cabin
just fine. (4) Quality of workmanship and materials hard to beat; designed for serious offshore work. (5) Not as much elbow
room as an IP, but I think has more usable storage
(deeper lockers, cavern under V, etc).
Good luck in your search.