We looked at a number of Sabre 28s during our search this spring. Many of them seem to have had a lot of use...though that is a probably good sign. Watch out in particular for the support block beneath the compression post in the bilge. It was not glassed over during construction and they are prone to rot. Lift up the floor board just aft of the door to the head and feel around. If the wood is soft it probably needs to be repaired. Also check the headliner above the compression post. Often it will crack do to a soft block.
We ended up with a Cape Dory 27 are very happy with it. Not as spacious as the Sabre but a solid and simple boat, plus it has some pretty classic lines.