Hey-
Just to share my experience on the Taurus path...
I shopped for a set of Taurus I's and never found anything in my price range. So, after a lot of research, I bought a set of Roland PK-5 footpedals and a Roland SH-32 synth module. The SH-32 is no longer made but you can find a used one for anywhere from $200-$300 or so. The PK-5's are like $500 new and much less used. Anyways, the point is with this setup (or something like it) you have waaaaayyyyyyyyy more flexability with sounds and how you control them. The SH-32 has two sub-oscillators, so it can really generate some amazingly great bass tones and much, much more. Yes, the Taurus I sounds amazing, but it really only has a couple of good, usable tones to use and you do have to service and maintain the Moog pretty faithfully (contact points, for example). Most people that find a nice set are too scared to even take them out of their home. Just food for thought... for $500 - $700 you could get a modern bass pedal setup to start making music right now and still shop for a nice set of Taurus I's when it comes up on Ebay... for at least $1500 (from what I have seen).
Just my two bits.
Andy