Fishfinders..whats best bang for the buck?

[dharhigh1]

I have a Coleman Scanoe that I fish out of and I am looking to put a fishfinder on it and can use some help deciding what to get. My space is somewhat limited and I would like to keep the cost down. I have been looking hard at the Hummingbird Piranha 20. Does anyone have an opinion on this one or others that they would recommend. I am primarily fishing for Crappie and Blue Gills.
Thanks in advance!

[crappieken]

This past year I purchased an Eagle Cuda 128 to put on my 12 jon boat that I use on several small lakes and small rivers here in east central Illinois. It also measures surface temperature. I paid $78.67 plus tax for it at Walmart. I am partial to Eagles and have two more expensive models on my bass boat. One of the Eagles on my bass boat was purchased in 1990 and I have never had one ounce of trouble with any of the three.