I guess since you have to buy the PM2 for U could just go Jr. and add everything onto it for a little bit of savings, but if you want I/O and a couple of other things that are built into the full Apex, then it's just a "little" bit more. I used marinedepot for pricing and it came to $312 for the Jr., PM1, and PM2. If you can't see yourself using any of the additional features in the long-run, then it's not worth an extra $250 for a display.