There are 2 spencer 28 om T/M which one? the round bilge or square,if square it will be tight with family,over grown stileto.I had the Sabre 30 and not a great cruising yacht but we had fun.
Compass790 hard to tell from photos but a couple on the Web look roomy enough.
Nova 28 a lot produced in ply but the one I saw om T/M is glass.
Depending on family size ages going by T/M photos I would be looking at the Nova but then again at the Nova price you could get a D28.
All comes down to maintaince,mechanical,sails etc