I carry three different putter molds when I'm using my regular bag. I like using a Sole for my main putter, a VP for windy putts and occasional approaches, and a Challenger for my driving putter.
I feel like this gives me a good putter line up to hit whatever lines I need. I have debated looking for an understable putter also, but I think that I could probably hit any line that an understable putter would hit with my Comets.
2013 Vibram Disc Golf Street Team
Last ACE: 3/10/2013 - 176g M Ibex
Metal hits since last ACE: 8