The Indi 2 has aftertouch now
Is that important to U? Plus the EQ. Plus the Mod matrix improvements. Plus future upgrades. But you can get the Indigo 1 on Ebay now for like $1300 so it's $500 cheaper than the Indigo 2.
So to answer your question I'd have to say that if aftertouch is important than get the Indigo 2. If money is important get the Indigo 1. They both look great and have the same engine