Wingman, I think generally speaking, the C-30 is considered to be a very well designed coastal crusier that has been refined over the years, by and large to what a number of sailors wanted to see in a racer/cruiser in this size and price range. I've read that Catalina encourages consumer input. If the individual boat looks well cared for and surveys well, I would think personal preference in amenities would rule.
Here in Florida, I would look for the wing keel version (not interested in formal racing and need the shoal draft), bimini/dodger (for my beautiful skin

), refrigeration for obvious reasons and I love the swim platform/walk thru transom (began in 1993-4 IIRC). That swim platform makes for easier boarding from the dinghy or after a swim. Oh, and dock side air, again for obvious reasons!
If I were to get REALLY picky, I'd go with the tall rig and wing keel. The tall rig would be better for the lighter airs here in central Fl.
Anyway, they build the things in all kinds of configurations and I've seen striped versions to one's looking like the mini weather stations you see at airports.

When you find one that suits your fancy...and surveys well, you will probably enjoy it for years to come. Oh, did I mention to have it surveyed? BTW, I learned basic keelboat sailing on a C-30 and loved the boat, so this opinion may be a little slanted.
Bob