Some very good advice provided here by experienced players.
Putter upgrades have been the subject of many posts in the forum. IMHO, unlike most other clubs (or even the balls), the putter boils down to what you are personally comfortable with...price and specs are a guide, but comfort and effectiveness are the keys. Many excellent players still use very cheap putters (Borigard putts lights out and she uses the $4 spider) and many others still use the free starter putter, and they also bomb in from everywhere. The Rossa putter also remains a popular choice (only $7)
I had the level 35 spider and found it better for me, than any of the higher level spiders. I tried the nikes and the max putters...couldn't adjust to either brand...so, over time, I settled for the lvl 70 versa...it has the slowest meter and its other specs are decent. I will probably stick with this one until the end.
I am not a great putter, because I don't read green speeds or breaks very well...but no putter will help you with this.
good luck.
ct