The Road Machine and the Cyclone best replicate the resistance of an outdoor ride.  The resistance is speed sensitive and basically follows the power formula of the outdoor ride, which is when you double your speed the resistance from the wind is cubed ot 8 times as hard. 

While the Cyclone Wind Trainer has the lowest cost, it will get loud at speeds above 17 MPH.  If your average speed is greater than 17 I would recommend the Road Machine Fluid Trainer. It is simply the best and you will appreciate the difference every time you ride.

The Cross Country has user controller base resistance.  Shifting your gears or increasing your cadence will increase the speed and the resistance will get harder, but it does not feel like an outdoor ride.  The braking mechanism too effective and there is no coast down.  Think of it as a direct drive, when you stop pedaling it will stop moving.

The best thing to do is visit a local bike shop and test ride the various units. You can also call customer service and they can provide you with additional pre sale information to assist you in your trainer selection.