28 is in another price
bracket since it is also in another build quality bracket. Although I've owned Catalinas in the past I've also sailed on Sabres and know the difference in the level of workmanship, which is reflected in the price of both new and used models.
The Catalina provides the most bang for the buck in it's category, they are well built and decent sailing boats, there are tons of them on the market.
Because Sabres were more expensive to start with most tend to be better maintained over time, but like any boat, it depends on the last owner.
If your buying
a Catalina just make sure you inspect the boat well, like any used boat
it's condition is directly related to the care and maintenance
of the previous owners, since there are so many around it would be a good idea to look at a number of them before putting out your hard earned money
Just seeing a number of boats on the market will give you a good feel for what is a good deal and what isn't, just resist the urge to purchase
the first one you see, it may take longer but in the end your patience will be rewarded.
Good luck, hope you find the boat your looking for.