I am planning on buying a fish finder in the near future. I would
like a small, portable, unit since I usually do some fishing on canoe
trips that involve portages.

Units that appear to be suitable:

Hummingbird Piranha series
Hummingbird Smartcast RF30 (Wrist Unit) or Mobile Station
Hawkeye/Norcross FF3300PX
Eagle FishEasy 2
Eagle Cuda 128
Garmin 80
Garmin 120

Others?

Anyone have any recommendations or warnings on any of these fish
finders, or others?

TIA