Recommendations for a tonearm upgrade on a VPI Classic 4 turntable

Greetings Everyone,

I have a VPI Classic 4 turntable that I bought with the 12 inch JMW 3D tonearm. My cartridge is a Dynavector XV-1S. This is the first unipivot tonearm I have owned, and after a year I have decided that I really don't like it.  I am considering upgrading to the 12 inch VPI Fatboy gimbaled and would love to hear your opinions on that tonearm, or others that you think I should consider.

Thanks!
TMQ