The PA3X LE DOES have aftertouch, just look at the specs at korg.com.
http://www.korg.com/us/products/synthesizers/pa3x_le/page_3.php

Another difference to the full PA3X is that it has PCM RAM of 192MB like the PA900 compared to 256MB in the PA3X (which you have to add by inserting the expansion board).