Ooooh - nice! Our classroom frag tank (in progress as usual) is a 22g long and I think bookshelf tanks are beautiful because they look like huge tanks in miniature. You might want to check out Nano-Reef.com if you haven't, if only for ideas and to compare equipment options. It cracks me up though when I try to compare my tank to others', but they have a 22g reef with a 40g sump. We use a Current Orbit LED light and it is fantastic. Despite our lack of planning and care, the coral color is awesome. Also, it is not cheap, but if you want it to be an all-in-one, you can get a little box that fits across one short wall inside the tank to hold chemical media and all equipment except circulation pump.
Have you been into freshwater? Or saltwater fish?