Rival is $200ish if you're lucky.
Force seems to be somewhat "rare" right now (lots of Rival take-offs which bring the price down), most of the Force take-offs are 2009s (no white graphics) which have less functionality than 2009 Rival, so Force seems to be fetching $275-300.

If you're torn between Rival/Red it might be an actual decision. If it's between Force/Red I think it's a no-brainer ... get Red