Man, are you trying to start a bloodbath, or what? hehe That's all a matter of opinion, and opinions is what we got plenty of on this forum.
I suggest you go here:
http://www.catfish1.com/forums/forumdisplay.php?f=327 and read what others have to say, then go to the manufacturers websites and review their info. That way, you will be able to make a 'semi'-informed decision.
Seriously, Lowrance and Humminbird are by far the most common in use, but there are so many models and features that it can be very difficult to decide. One suggestion: go for the biggest screen size, most pixels (read: resolution), and the most output power you can afford. GPS is an extra-valuable function, too.