To be considered the 3 best runs in the state, they must take up a full day, be challenging and be really really fun, so that you want to go back again and again. With this in mind my top 3 would be...
1) NFSP - Bailey to Pine - long fun class IV with 3 fun class V's to keep it interestering.
2) Upper Animas - long, very fun and never boring. Option for overnighter.
3) Arkansas, Granite through the numbers - long very fun, very high quality run with lots of play and Pine Creek thrown in to keep it spicy.