Not Greg but I'll give a little advice ....and that is to match the sonar technology that would best suit your fishing needs at the TM...

If you're 2 poling....2d/DI combo is the berrires..
If you're looking for new structure...SI is the best
If you're bouncing from brushpile to brushpile ...GPS chartplotting is a must...

Decide which technology will help your TM time the best...
Then decide how much you can spend to get extra bells and whistles on top of the 3 main sonar texhnology choices..(2d/SI/DI)...

(Oh, and just for clarification.. The 788 does not come in an SI model...the 798 does)...

Rickie