These are many of the things I've been thinking about, too. Plus I really like caches that take me somewhere I wouldn't otherwise go. In a city like L.A., there's so much to see that even urban caches can accomplish this goal.
I like things that are a little challenging, also, so puzzles and offsets appeal to me. I think, at least in my head, I kind of want it to be some sort of epic cache. After I've found a few more, maybe my expectations will become a shade more realistic. Or maybe the perfect idea will hit me. Until one of those two things happens, I'm content to kind of sit back.
It's amazed me, so far, how many small details get missed. A lot of damp logs without baggies, no pencils, etc. Of course, I understand that a lot of these caches have to be very small because they're in an urban environment, but those aren't my favorite. More than anything, I want to create a cache that I enjoy coming back to time and again to check on.