Ok, raised my price range to 1500-1800. Looking at a Trek Fuel EX5, a Scott Sparks 960, a GT Sensor or 4.0, and a Giant Terra X. I ride ruff, rocky, roots, muddy, winding, single track with some good climbs. Any suggestions welcome.
I'm 5-9 155.
The bikes you listed are all pretty different from one another. Here are my thoughts:
Trek Fuel EX 5 - good bike all around, pretty good component spec for the price, good suspension, would be good for an all-around trail bike.
Scott Sparks 960 - best drivetrain component spec of the group, but it's also the only one with 29" wheels, and it only has 100mm of suspension travel. The suspension isn't that great. Coil sprung up front and an ok shock on the rear. It's an XC bike, not so much something that would be more at home on rough terrain.
GT Sensor 4.0 - Pretty much the same suspension setup as the Scott, but with 120mm of travel. Drivetrain components are practically bottom tier Shimano. Not bad, not great. A few local guys around me have owned GT full suspensions and don't favor them because of the high center of gravity they have.
Out of these...I would pick the Trek. It's the best bang for the buck. However, there are a lot of things to consider. Do you want a 29er? Do you want a longer travel trail bike, or a short travel XC machine? If you're looking for an all-around bike that you could do a little of everything on, you should look for something with 120-150mm travel, at least mid-level components (Shimano Deore or SLX or SRAM x.5 or above), Thru axles if available on the particular bike, and a good set of wheels.
If you're referring to a Giant Trance...that would be my pick over the Trek.
That said, a Stumpjumper fits that bill pretty well if you could find one in your price range. Decently light, strong, good components/suspension, etc... I love mine. Santa Cruz is another option to consider and those are usually found reasonably inexpensive. Browse for the Heckler, Nomad, and Blur models.