Norm,
I don't suggest you get an original
Moog Prodigy, unless you like to open up your synths every few months to calibrate the oscillators. I own my original and first synth, a Prodigy and, although I love it and still use it, its notorious for falling out of key and is susceptible to all sorts of instabilities caused by temperature fluctuations. I have to let it warm up for about 30 minutes before I can record with it. Because of all this, it stays put in my studio and never leaves that environment. The Pro One sports the same challenges, as do most of the pre-MIDI analog synths. They're just too unstable, despite their killer sound.
If you have a controller keyboard, you could go with an
Oberheim Xpander, a module of unprecidented programming power, for the individual willing to brave a very deep analog environment.
For cheap, you could get Korg's
MS2000, extemely powerful four-voice subtractive synth for only about $600.00 US for about $2300.00, slightly over your budget, I know, you could get the
Dave Smith Poly Evolver Keyboard, probably the most powerful analog style synth available today. If you're up for some programming challenges, the Korg Wavestation, while not really a subtractive synth, is capable of some very unique sounds.
There is a plethora of soft synth choices, as well and, before you snub your nose at them, consider that they're much cheaper than their hardware counterparts, very stable, and capable of producing sounds never before heard. Korg's
Legacy Collection, NI Absynth, Arturia's Arp 2600V, Arturia's Moog series, they all emulate their original analog fathers very closely, at a fraction of the cost and without the stability issues.
Hope that helps. =)