I got the 106sv/gt54 on the $999 deal to replace a 93sv. Liked it so much I went back to get another and they were out of stock so I got the 126sv/gt54. The new untra 2's have more bells and whistles but mainly the gt56. They do have wireless networking between other ultra 2's and the Force trolling motor and faster GPS but really is the same on everything else so your gt56 will give you the same picture as a ultra 2 if you put it on a ultra 106sv