Depth finder recommendations?

I looked up the humminbird for $100 at overton's and like it, then I saw the Faria (sp?) one that does air and water temp also for $180,

wondering who has any experiences with either although I read the faria one has the temp sensior above the water line on the transom outside the boat, can you hide it elsewhere, I don't have a trawler so that would look funky, it's not how you do, it's how you look


Any other brands out there that would be a better bet?
Thanks