fish finder

whats a pretty good fish finder for a kayak that is good priced that does pretty much everything you need and is easy to use?

Pretty vague question with no real answer.  It really depends on where and how you fish and what you consider a "good price" and how you define "everything you need".  Personally, I am a shallow, freshwater fisherman.  I typically target bass, stripes and an occasional salmon in the Sac Valley, Delta, or on Clear Lake.  I have an Eagle 350 w/ GPS and an Eagle 320 as a backup.  Both are inexpensive, under $150, and work great for me 99% of the time.  I can easily move the units from my yak to my boat as needed. 

The GPS in the 350 is limited to a very basic base map, with no option to upgrade, so it may not work for salt guys looking for more detail in their GPS.   I use my iPhone in situations when I need more info.

Space, weight, and battery limitations may also influence your decision.