I'm building an arcade machine based on an xbox, it's gonna have 2 white, 2 red, 2 yellow, 2 blue, 2 green, and 10+ black buttons.  I'd like to have the 8 colored buttons lighted as simply as possible.  The remaining buttons I'm hoping are indistinguishable texture wise from the lighted buttons.  
I like the simplicity of ultralux buttons, but the sharp edge, and the lack of an unlighted equivalent is leaving me scratching my head.  Concave or convex I don't really care, but I don't want to pay for 20+ lighted buttons either.