Some really good drinks I've found:
Virgil's. Everything I've had of theirs is good, but the best by far is the Black Cherry Cream Soda. So delicious.
Reed's Ginger Ale and Ginger Beer. The ginger beer is quite bracing. Probably an acquired taste but I find it goes really well with food.
Boylan's sodas are all good, especially their birch beer, which is one of the few examples of the style that seem to be regularly available
Sprecher sodas are good, although since discovering Virgil's I like them less