Join Date: Mar 2011
Location: Chapel Hill
Bikes: Canfield Yelli Screamy, Pivot Mach5, Specialized Roubaix, '65 Hercules, '79 Schwinn Stingray Lil Chic, '68 Schwinn Stingray Fastback, '89 Specialized Allez Epic, '86 Battaglin World Champion
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Seems like you could break those up into two groups. One consisting of the Covert, Enduro, and Tracer275 -- 160mm rear travel and burlier frames. The other containing the Spicy, Carbine, and Force -- 150mm travel and less frame weight(assuming same materials). Comes down to intended usage and which would better suit your riding.
FWIW, if going with Intense, the T275 was built from the ground up as a 27.5 wheeled bike. The Carbine on the other hand was transitioned to 27.5 from 26 by way of machining slightly longer dropouts to accommodate the larger wheel.