I attempted on editing my previous message, but was unable.
What I would have wanted to make clearer about fps,
is that Canon 1D has to pay in pixel its higher 8 fps
capability, by getting 4 Mpx only; also keeping X-Sync
at 1/500th, though.
Looking at the other side instead on Cameras slower
than 2.5 fps, some Fuji (S1) and Kodak (DCS 760)
models (fitting Nikon Lenses), do run 6 Mpx like Nikon D50 and D70, yet they turn to 1.5 fps only;
and without any saving on price, no longer.
So, D50 and D70 really offer the best combo of Mpixels,
fps, X-Sync and Price, in my opinion for sport shooting,
at today.
Now, to get a Zoom Lens ".. that might be adequate for
both outdoor and indoor shots ", You should take into
Your considaration that inside a gym, hardly You'll
find more than EV9 as Ambient Light coming from the
existing Lighting plant/windows.
Most likely, EV7 only, too.
EV9 means f/2.8 at t=1/250th, with ISO-400 ;
EV7 means f/2.8 at t=1/250th, with ISO-1600;
Also taking into consideration that You may find
motion blurr on anything sport pic, shot under 1/250th
well, any Zoom-Lens able to keep f/2.8 along any
Focal-Length, is welcome in sport shooting, then.
Motion blurring, less affects working through Wide-Angle
Lenses, but in sport We have usually to plane around,
Normal to Tele, Focal-Lengths.
Enzo