A stock bimini from your dealer would be my first choice as well. Otherwise, many online sites carry a variety of quality bimini's that should work for your X. Check out Boss, Titan, and Skylon at Wakeside.com.
Andrew, I don't know where you are located, but Adlee covers makes great custom bimini's. They are at http://adleecoversboats.com/ They can custom match with stripes and other items to trick the boat out at a great cost. They are usually lower than the dealer covers.