Fishin' Buddy's are now made by Humminbird. I was going to pick one up, but they only have the 120deg cone angle, which I find to be a bit small for lakes. Perfect if all you need is a depth finder, but I like to be able to mark fish and the wider cone angles cover more water. WalMart Langley sells the Fishin' Buddy 110 (I believe that's the model) for $129.99(?). They run on 4-6 AA's, so the costs can add up over time I think, especially if you already have a 12V on your boat that you can hook up a sounder too.
Garmin's echo line includes the 300C, 500C, 550C; all colour models (hence the C, as you're probably aware of), if you're into that. Apparently the echo line is good all around; from fresh to salt, but that is just what the marketing says

I can't comment on how it works at speed, because -- again -- I use mine in my kickboat (1km/h?? lol...)
Anyways, just another unit to research a bit more; I'm no Garmin rep
