Some thoughts that might help you decide:

Rocky Mountain RC 10V -- The high gearing (30/42/52 in front) and 32mm tires have me thinking of this bike as primarily a pavement bike. Nothing wrong w/that. Just wanted to point it out.

Kona Dew -- Close-to-mountain-bike gearing (48/38/28), larger cog in back (up to 34 instead of up to 32), and 37mm tires make this bike more suitable than the Rocky Mountain for dirt-pathing and gravel roads and such.

Specialized Crosstrail -- Even wider tires and a suspension fork skew this bike more towards the dirt end of the spectrum. FWIW, I do not like that this bike has a 7-speed drivetrain. 7-speed is old tech, and suggests a freewheel rather than a cassette hub. I'd probably give it a miss in favor of an 8- or 9-speed model.

When thinking about the above three bikes, think about how much you plan to ride on pavement versus dirt. If you plan to hit dirt roads a lot, I'd go either Crosstrail or Dew. If you're thinking of 20 mile paved-road rides to improve your cardio fitness on a weekend afternoon, you'll probably like the Rocky Mountain better.

Giant Cyprus -- You get a bolt-upright riding position. Hence the need for the suspension seatpost, to cushion your spine. This is the bike to get if you just want to toodle around the neighborhood, nod and smile at your neighbors, that sort of thing.