Try every putter you can get your hands on.  Ask if you can use the on the putting green.  Heavy putter's for slow greens and light putters for fast greens.  Stay away from the putter that take all day to line up.  When you come across a putter that looks good and feels good.  That is the one for you, it may be $19.95 or more.  All putters feel different.  So, make sure when you find the one you like, get that putter.