If you like a traditional pump for upland but hate the weight in the field, an Ithaca 16 ga. is about as good as it gets, IMHO. I've had a 37 in 12 ga. for a few years, but only recently obtained a 16 ga. 37.
The only real disadvantage to them I have found is that it takes a while to learn how to load a shell directly into the chamber. (Well, it took me some time, anyway!) The light weight means you won't be using one for trap, either.
I am no expert, but I think you want a slightly "newer" one like you have. My father's 16 ga. 37 is older, and he had to ream the chamber to shoot modern Remington shells. His guess was that it was cut for paper shells. Again, I'm not sure what the deal really was. Hopefully, someone here can shed some light on this...