Fish finder for less than $150?

[Jiggy81]

Its going to be mounted on a Inflatable boat actually. Specifically this boat.

http://www.amazon.com/Intex-Mariner-4-Pe...+mariner+4

Its a great 1 to 2 man boat. I dont have the space for a real boat and trailer so I like how i can just pack this up in the trunk of honda accord and store it in a shelf.

These are the fish finders i'v been looking at. Picked these base on price and amazon reviews.

http://www.amazon.com/Lowrance-Mark-5x-5...ish+finder

http://www.amazon.com/Garmin-Echo-101-Ca...ish+finder

http://www.amazon.com/Lowrance-000-11448...ish+finder

I'm a newbie with fish finder in fact i've never even seen one operate in real life! lol.. I dont know if I should go for the cheapest one I can afford and upgrade later or get a pretty good one and dont worry about upgrading later. This is another fish finder i've been looking at and read this is the best fish finder for the money.

http://www.amazon.com/Garmin-Echo-551dv-...ish+finder

I can probably do $250 but is it really worth double the price of the cheaper ones?I mostly like to troll with my 1 man boat and would love to just see whats under the water and of course find them fishies! thanks
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