I paddle a 2008 Epic16X. I retrofitted my boat with the new articulated stern that has the rudder that swings down. Epic offers a retrofit kit and it was relatively easy to fit the updated rudder, which is vastly more effective than the original with only the little nub on the bottom. The new models also come with rotating cams instead of the old straps to seal the hatch covers; also there is now a day hatch, and the boat comes only in white.
Besides retrofitting my boat with the new rudder, I also modified the hatch cover straps to include snap-clips. These make the strapping system much easier to use, allowing me to open and shut the hatch covers quickly. If you find an older model 16X available at an attractive price and put a little work into these modifications, you will have a superb boat for maybe a fraction of the cost of a new one. I love my 16X--best boat I ever had.