I picked up mine (Indigo v1) on Ebay (UK) for a measly ?410, to tide me over...

Couldn't believe my luck, mint too. Anyway, here's my experiences, in use:-
Aftertouch is a problem for me, but I use my Trinity (which has 61 notes, inc. channel-pressure/aftertouch) as a master keyboard to trigger it. I very much dislike the Virus' vertical pitch-bend and mod wheels too, so the Trinity also bridges that gap. Also the Trinity has a superior keybed. - Am not sure if it's the same with all Virus', but the keybed on the Indigo v1 feels very toy-like.
However, the Indigo's overall small-ness with its own little keyboard is great for portable sound-designing when playing away from the studio.
I tend to use the Virus mainly in standalone mode, as opposed to many sequenced multiple channels at any one time, so the 24-note polyphony is enough for me at this time, but if you wish to have loads of virus parts playing all at once then the 32-note poly of the C would obviously be more desirable.
However, the trade-off between cost and features made me buy the Indigo v1 on impulse, as the synthesis engine is essentially very similar other than it has more limitations than the v2 model (and minus features such as the Moog emulated filter, channel 3-band EQ, etc.). But as I say, I bought the v1 just to tide me over...
>>My main concern is that the focus on OS updates will shift to the C series.
I would imagine that might be so, or thereabouts. It's all about what you want to get out of the synth, and the money difference between the two to justify those differences. As it stands, the Indigo v2 commands around a ?400-500 difference to the Indigo v1 on the second-hand market. You have to weigh it up, while still thinking of any future demands you might have of the synth.
Best wishes
Timo