Indoor telephoto lenses - no flash allowed
Well, you have a great camera to try and get your shots with, Scott.
With the α700's stabilization and a pretty noise-free ISO-1600, you just might be able get away with f/2.8 ... but, your focus better be dead on at that aperture. This would be the case with any camera. The lens I would choose for your shots would be the TAMRON SP AF 70-200mm f/2.8 Di LD, but it will not be available until June, this year, for around $700.
Another solid choice, available right now for the SONY DSLR, would be the SONY SAL-135F18Z - Carl ZeissŪ SonnarŪ T* 135mm f/1.8 (<- click here) Telephoto Lens. Now, this lens is not for the feint of heart, but it will get the shot you want. The price tag is a nifty $1400, but it delivers a bright & fast shot. You will pay dearly for that ... that's the real cost of "no-flash." Think of all the money you will save on batteries, too! The lens provides what you would effectively get with a 200mm mounted on a Full-Frame (FF) or 35mm-film body. It is truly a "hot shot" on an APS-C sensor camera.
I have a TAMRON Adaptall2 MF 135mm f/2.5 which is a nifty lens ... but manual focus. For action-type shots, it cannot "rocket-autofocus" like the SONY ... with manual, you have to get ahead of your subject and predicitively focus on a mark. What I can do is shoot various distances with a subject and determine what you could expect with a lens of this focal length.
What I can tell you is that many film photographers were using a 200mm f/2 lens for the Olympics. Based on that, the 135mm f/1.8 would seem to be perfect on the A700 (APS-C sensor) for the same purpose.