Check out this guys review of the Microsoft Sidewinder X6 (scissor switch) gaming keyboard where he discusses the wrist rest.
https://www.youtube.com/watch?v=u3R7BlGxSQIA lot of gamers like scissor switches or chiclets and really flat keyboards for extended gaming. Like the Razer Deathstalker or Steelseeries Apex
That being said, gaming keypads are a better solution than gaming keyboards for no compromise comfort/performance.
I like the mechanical switches or scissor switches myself, and really like the any key macro ability of many of the gaming keyboards, plus individual key backlighting control (especially with full RGB) for learning new game controls. Plus Tenkeyless to pull the mouse in closer.