Peter. Welcome...
Nobody has mentioned stocking levels,(Dragon likes them mid thigh I believe), so here is what I would do if I were you.
You say you have this size because of the location you have planned. I will assume then that you are planning on having this tank prominently displayed. I'm assuming a size of about 45 gallons, since it is half as tall as my 90 gallon. Many rules of thumb here. I usually go by the old inch per gallon,(less tail), of fish. However, with the incredible amount of surface area you have for a tank this size, you oxegen exchange will allow you far more than normal. I would feel comfortable bumping it to sixty inches. And then I would do a cichlid tank. The Master can give you some great tips here. Most cichlids breed readily also, which is fun.
Plants. With only a twelve inch tank heighth, this tank will be a live plant dream. With some advanced planning and patience, you have the basis for a beautiful tank.
Let me also add, I think cichlids would be great because of their larger size, and they tend to get along fairly well with each other when you can have the sage advice of someone like Larry,(master), to help you pick them.
PS..I'm still trying to figure out if "all his glory" is a jab at me or not.. :laugh: