Finding a comfortable putter does make a world of difference. However, also knowing what type of putter you are and building the proper fundamentals can be even more helpful. Are you a push putter or a spin putter? Are you already pretty solid in the circle and looking to expand that, or are you missing a lot of puts within 25 feet? I would say if you’re not solid inside 25 ft. work there, and only there first. Know how to stand, how to grip the disc, and overall build a consistent putting style that will help you be successful time and time again.
I started with the Avair and liked it a lot. As I developed my putting style (mostly push putting) I found it to float on me too much. I then switched to the Pro D Challenger which was like putting a brick compared to the Avair. After a year or more of nose down, low putts, someone put a Pro D Banger in my hands. For me it worked and I still throw it today. With the putters before I was finding my thumb placement to be extremely inconsistent. The groove on top of the Banger solved that problem and helped me become more consistent. The funny thing is that I’ve heard the Banger is the last putter a push putter should ever use because it impedes a clean push release. However it works for me.
Here are two of the best putters in the world talking about putting. Some good information here; two different styles of putting, also info on stance and grip. No one way is the best. Play around, see what’s comfortable and most of all practice, practice, practice.
http://www.youtube.com/watch?v=FtO3pwFesZ0