The only reason I haven't been fishing lately is I haven't had any time. I used up all my vacation last year and I am itching to go. Had an apportunity to do a Tautog, Flounder and Bluefish trip out of OC but had to bail due to lack of water at the ramp. This weather is really starting to suck.
For the record, I love my Lowrance LMS337c but was very unhappy when the transducer delaminated and fell apart. What did you end up buying?

Dave, i will give you my unbiased opinion as i have both on my boat. I have the Furuno 620 FF unit, and a Lowrance Globalmap 7200c (GPS only). The Furuno is without doubt a fine unit, but i also like the Lowrance gps unit, and it has served me well so far.
I was playing with one of the new Lowrance HDS units in the local Gander Mountain and i gotta tell you, i was impressed with the definition and detail of the display.
I fish the Chesapeake too, and either unit will serve you fine. There are a ton of the Lowrance units out there, and from what i've seen the Lowrance FF units work very well.