Irwin 38 Centerboard
When I mentioned the speed, I was thinking in terms of racing vs layed-back cruising. You''re not going to win any races, but she will do just fine in terms of cruising. I should also mention that leaks were a big problem with Irwins. Did the owners caught them and fixed them properly? Again, the need for a good surveyor.
If you intend to use her for a cruiser/liveaboard, it will be a good choice. CBs do present some issues in terms of maintainance (requirements and ease of), but they allow you to get into spots that others can''t.