As others have said - spend some time in the IS search. This topic has been discussed many times in the past. Not sure if you are planning on keeping the camera down the hole to monitor the fish in your area or use for scouting - so will answer what I do.
I have the Marcum Recon 5+. Got this unit because I want the direction the camera is pointing, depth and water temp. If I didn't have this unit, I would get the Marcum Pursuit. Have not seen it in person, but from the videos that I have seen - this is the best camera picture of all the units. I use my camera to scout the area for weeds and fish, then I pull it up and use my flasher. I don't leave the camera down there.
I also looked at the Aqua View 5.0 (? Revolution) unit - I like their cable management system, but the Marcum camera is better in my opinion so, this is the way that I went.