Welcome Rambo!
I don't own any of the models you listed, but I have owned a B30, and do own two Gamo's (S1K and Hunter 220)..I'm guessing by "new Hunter" you're referring to the Hunter Elites and such. My B30 was a nice rifle and looked pretty good out of the box, but it did need a little work before it really was good...never was great. I hear that the others, the B26 and the B40 can be real good out of the box, but I've heard better reviews of the B26 than the B40...again, I don't own either of these, although I plan to:) The Gamo rifles, the two that I have were both pretty nice right out of the box. Not too much gunk, not too much hassle...., but I did purchase a Gamo Delta last year that was a real POS, and I took it back the day after I bought it. With any of these guns you have to decide what kind of energy you want to put into them, and what kind of performance you expect from them. If you think that you're going to get 1 hole 50 yard groups right out of the box, you might want to find something else. If you are a bit of a tinkerer, or don't mind paying someone a few bucks to tune one of these, you should end up with a pretty nice shooting air rifle. I think, from my somewhat limited experience that any of these guns, unless you get a dud, can be made into a great little gun...with a little work. Good luck, and welcome aboard!
Dan