Not to disagree with the previous posters' evaluations of those models, but if your goal is to find something "bigger" than a Catalina 22 that will fit in a 24 foot slip, you don't have many choices. With all due respect, I just don't think that any of the boats mentioned above are more than $10,000 bigger than the Catalina (assuming your C-22 is worth about $5000, which I am deducing from the fact that it is over 40 years old).
If you are looking for a boat with a roomier cabin than the C22, I think you are going to be disappointed in the level of selection. One option is the Oday 23: unlike the C22, the head is behind a real door and bulkhead. And on the Mark II models (post '76), the "galley" slides under the cockpit seats (sink one side, stove on the other), leaving the salon open. However, the coach roof is fixed (no pop top on the later models), and it is only comparable in quality and price to the C22. In other words, not really a step up.
The only boat that I can think of in that size range that has a "big" cabin is the Flicka, a 20 foot Pacific Seacraft. Almost 6 feet of headroom! But she is a heavy displacement, full keel boat that might not be suitable for lake sailing. You would also have to get an older model in order to meet your price point. Also an absolute beast to trailer.
Now, if you are looking for a boat that is "bigger" in the cockpit area and are willing to forgo cabin space, one other option comes to mind:
The Oday Tempest is a 23 foot boat with an big cockpit; it will fit six adults comfortably. Beautiful lines too. The cabin? Not so comfortable. V berth, sink, toilet.
If you just want a change after 30 years, then I think any of the boats suggested in this thread would be interesting options to explore. However, if you really want a boat that is appreciably bigger than a C22, you will need a different slip. IMHO, the next size boat is really the C25, and you really need to go to a 27 foot boat in order to move out of the trailer sailer sized boats. Good luck.