I own a Weatherby SA-08 in 20 guage, 28" barrel. I love it. The length of pull is a little shorter than many other guns, which I like. I've also shot an SX3 in 12 guage. It was a dang nice gun, too. However, it is quite a bit heavier, so not as great an upland gun if you're doing a lot of hiking.
The Tristar Viper is basically the same gun as the SA08, without the interchanging gas valve system. I don't mind the interchangeable gas valves, but it does require some forethought before you pick your load and go out hunting.
Another gun I really considered was a Franchi Affinity. I thought it swung and pointed really well in the store, but it was a lot more expensive than the Weatherby.