I've owned the eagle 320 and the cuda 168. Out of the two I like the eagle much better. There are more options, better pixels, larger screen, however it is a little more in price (150 vs. 60), but there's really no comparison.
Eagle is made by Lowrance (if you didn't already know).
There's also a thread here that tells you how to tune your finder. It will get you close then the rest is up to you, as far as pefecting it to your liking.
Good luck!