Fred,
As you've found, rotators are quite a bit of maintainance. I don't use them anymore and have gone to fixed wire arrays (and aluminum Yagis) that are dedicated to a particular direction and job. For the average installation, it's sometimes desirable to focus on only one or two bands at a time and put in a big effort into them - this creates more fun and better ears.
In your case, you might consider picking your favorite higher band(s) (10m-75m) and making up a phased driven dipole array switchable NE/SW. Hang a single aluminum 2.5" - 3" diameter 30' boom at the top of the tower with pulleys and ropes on each end. Also, a pulley/rope on the tower at the top. This will give you good spacing flexibility. Then you can haul up any 2el or 3el wire antenna you wish as the years go by. You could hang an inverted vee driven array for 75M or 40M, or 20M or 15M or 10M and focus on one particular band at a time with big results. You could also hang two (or three) arrays for various bands as long as one of them is not 15M. (interaction) The boom will swing around the tower 90 degrees if you hang it with overhead trussing, so you can manually hit other areas if desired, rather than just NE/SW. Rotary antennas are not mandatory to have fun and performance.
Just like a flashlight, magnifying glass, telescope or megaphone, focusing and directing RF energy into a given direction results in hearing things that a bi-directional dipole or omni-vertical cannot hear. A front to back cancels out most of the atmospheric noise and QRM off the back, leaving a focused lobe in front to hear what counts.
Flexibility and easy maintainance becomes more important as we all get into old-buzzardom. Experimenting with easy-to-raise wire arrays is half the fun of ham radio.
..
BTW, you don't need an expensive crane - take that Yagi down with a tram line run from the tower to the ground. Ride the Yagi on a tram-pulley with a second rope controlling the descent. I have put up and taken down full size 75M and 40M 300 pound Yagis by myself using that method.
T