Trying to decide on new fish finder for kayak. My choices I'm looking at are:

1) Humminbird Helix 12 HW CHIRP Mega SI GPS G2N

2) Humminbird Helix 9 CHIRP MEGA SI+ GPS G3N

3) Garmin ECHOMAP™ UHD 93sv with GT54UHD-TM Transducer

I really want the SI and DI capabilities. I'm throwing the Garmin in because it is livescope compatible if I ever decide to go that route. I'm worried about the 12 being to large for the kayak. Be like trying to cast over a large screen tv when sitting inside a kayak. Any help would be appreciated. Thanks