Alan,
Your Fisher receiver sounds like a nice vintage piece. Any of the Omegas should work well with it as long as you don't suffer from tube glare (if you do the Omegas will make that very obvious as I found out with my TS-1's).
The full range drivers have very even and broad dispersion. I can move up or down a lot relative to the speakers and not notice gross changes in the tonal balance of the speakers, except perhaps at the very high end. This would make them work better in your situation (with the speakers above your head) than most. I would be concerned about early reflections from the ceiling though. I don't think you'll get much of a stereo image. Is there any way you could sacrifice some shelf space at ear level for the speakers?
Here is what I did (in case you are interested in another bookcase approach). I have 8 foot wide custom bookcases. The lower section is about 30 inches high and 14 inces deep. It has two shelves full of vinyl and large books (great for dampening bass vibrations btw). The upper section rest on top and is about 7 inches deep. I put a pair of TS-1 on top of the bottom section, which puts them at ear height for a seated listener. I have found that most of the diasadvanteges of having speakers in a bookcase (resonance problems and poor imaging) can be fixed with some tlc. I applied an adhesive sound dampening sheet to the entire rear of the bookcase (its a thin plywood). Then, on the room-facing side behind the speakers I put a sound barrier (rubber and dense foam), followed by a fiberglass ceiling tile wrapped in acoustical fabric. I have also tried using Vibrapods under the speakers, but to be honest I think I prefer the direct coupling to the hardwood underneath (the weight of the records, books, and hardwood is probably several hundred pounds!). Finally, there are two 7-inch deep shelves loaded with books above the speakers.
To improve the imaging, I placed 8 inch thich acoustical wedge foam (the kind used in anechoic chambers) next to each speaker on the inside edge, with the wedges tilted to absorb the sound coming from the edge of each speaker. This has an amazing effect on the stereo image.
I'm not done yet with the room acoustics, but the net effect of a fully loaded well-damped bookcase with foam treatments behind and to the side of the speakers is very positive.
