When this question was first answered almost three years ago there were two different color fishfinders in that price range. Now there are plenty. Check these out.
I would register at The Online Fisherman if you haven't yet, and go to the forum section and private message the question to Kayak Guide Derick Burgos. He is the best Kayak Guide on the West Coast of Florida. If you live in Florida and ever have the urge to learn some really great Kayak fishing tricks, I recommend that you give him a call. (813) 447-4732
Derick will give you clear and honest opinions on the subject.
Thank You for sending in your question to The Online Fisherman. Please tell all your friends about us.
Captain David M Rieumont
The Online Fisherman Inc.