Fish/depth locator recommendation

[TJ2]

This question may be a bit vague so accept my apologies in advance.

My father in laws boat has an old hummingbird finder in it. It is nothing special (doesn't give good read on fish) and I want to be able to expand my horizons by searching out some new spots...not just sticking with the old standbys. I'd like to pick up a new locator that isn't going to break the bank and was wondering what is recommended for someone only spending a month on the water. We're on Vermilion if that makes a difference.

I realize this comes down to personal preference but any advice would be appreciated. Many thanks!

[Fishin4Life]

Fishmark 320 or the Fishmark 480. I have the 320, love it, wouldn't go with out it.

[PerchJerker]

Yep, what Fishin4Life said

[DTro]

I just picked up the 320 at Gander for $129. Pretty good deal.