The Elite 7 is the only one I saw that had both DI and 2D along with GPS and was under $700. The main complaint if you do a search here on this unit is that the processor is slow to update, especially with a Navionics chip card in it. I wanted to try the DI feature, but I wanted the old standard 2D as a backup in case I couild not tell what I was seeing. Once you get the DI settings right it is pretty clear, but can be misleading at first.

This unit does not have side imaging. I am still learing to read the other 2, the SI screenshots I've seen are a bit of a puzzle til you get use to it.