I use an HDS-7M (chartplotter only) as my chartplotter and a Furuno FCV-585 for my fish finder. I like seperate units. Best of both worlds and since you don't have to split the screen to see both you get decent size picture.

HDS-7 would be a great machine for you. Lowrance has come a long way in their customer service from years past. Just sent mine in because it had an issue after upgrading my software. They sent me back a brand new unit no charge.

I have no affiliation with these but found a few.

http://www.ebay.com/itm/NEW-2011-LOW...item3374f72223

http://www.ebay.com/itm/Lowrance-HDS...item1c262540ad