I just got an Eagle (made by Lowrance) SeaCharter 642 DF iGPS in July, and I could not be happier with it. It has a dual frequency transducer with temp, a water speed sensor, a 5" color screen with 256 colors that has incredible resolution, Chartplotting GPS with WAAS. The chart cards are only about $70 versus $125 for most other units. I just got my card and it is well worth it. There are a ton of other features that I am just getting used to. The Fish Finder is amazingly clear with the high res screen.
I got it from BOE since so many on this site recommended them, and they were all correct, they have excellent prices and even better service. I paid about $570 for my unit and another $75 for the chart card. The SAME EXACT unit with the lowrance name on it goes for about $200 more.
Here is my unit the Eagle site, they have a few other cheaper models if you dont want the dual frequency or higher resolution screen.
Here is a link for the 642 or you can search the site for other units.
http://www.eaglegps.com/Products/Com...rter642CDF.htm