You can afford up to $270 and want special switches?
Try a Topre Realforce, it uses Topre switches instead of normal cherry mx ones and some people consider them somewhat similar to the Reds in feel and you can generally get them for around $200. They are not specifically designed for gaming, but gaming keyboards have been made (including the official Japanese Counterstrike Keyboard) from them modifying nothing but their appearance.
There's also the WASD Custom keyboards that have Green switches, along with all the normal Red Blue Brown and Black (though I don't know if Green is particularly a good switch for gaming), you can fully customize their keycaps as well and they are a sponsor of Axiom Gaming so there's some pro-gaming credibility there.
There's also the Filco Zeros, Ducky Alps and Unicomp Buckling Springs, none of them spring to mind for gaming but they all have unique switches.