I'd suggest cured live rock instead of the fake rocks - I'm still new at this, but the LR is safer, and provides lots of benefits to the tank, and actually makes water quality and chemistry more stable.
Also, a skimmer, even a small one will also increase quality and stability. If done right, both of these things, from everything I've experienced and learned here will make your experience much more enjoyable.
My understanding is that damsels in general are territorial and difficult. There are many colorful wrasses, blennies and goby's that are relatively small in size - comparable to most damsels, and are beautiful, easier to manage, and many are just as hearty, offering a wider range of choices.
The Scott Michael Marine Fishes book is a great guide and worth every penny.
Also, some cleaner stuff - hermit crabs, snails, and a shrimp or two will also help keep the tank in balance and cleaner. Very little bioload, and a great help. The hermits and snails are mostly invisible - they just sort of blend in and do their work, and the shrimps are great to watch and the fish love to get cleaned by them.
For a center piece fish, the smaller angelfishes are colorful and great to watch. Since you're not planning corals, most of them will be relatively easy to maintain. The Michael Marine Fish book classifies them regarding ease of care, etc. Also, the live aquaria website is another great resource for info on specifics of most fish.
Aquarium Fish: Tropical Freshwater Fish and Saltwater Fish for Home Aquariums
Enjoy - and take the above for what it's worth - just one opinion. There are plenty of great ways to go from what I've seen so far.