Welcome to Geekhack and you should definitely join qtan's group buy (http://geekhack.org/showthread.php?20143-Key-Caps-in-stock-and-price-check-thread-Add-yours-wish-caps-here!). Lots of interesting looking key caps there.
Also I got that "panic" key cap from SP (they own pimpmykeyboard.com) and it works with Cherry MX. I'd be surprised if they stop making it compatible.
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(http://i4.photobucket.com/albums/y146/eddie84/OCN/Mech%20keyboard%20club/key%20caps/th_DSC05474.jpg) (http://i4.photobucket.com/albums/y146/eddie84/OCN/Mech%20keyboard%20club/key%20caps/DSC05474.jpg)
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Just got my panic and !@#$% keys from Pimpmykeyboards and they are still selling them as Cherry mx compatible.