The D945GCLF board is the board they use in the RX model of megatouch. it will take a 2 or 3 reboots, but the software should eventually pick it up and swap the drivers over to the intel board.
this is currently the best solution for a board swap on the ION series, as most of the asus boards are refurb or used and are probably getting close to croaking anyways. The D945GCLF(2) is still available at some vendors as new stock. i wouldn't even consider the purple ECS board for anything.
P.S. if you do have a machine with the purple ECS board (like the elite edge etc.) and it's still working, put a fan on the chipset it will last much longer.