Chris, Lowrance has several units that might work. The HDS-5 and Elite-5 models will probably meet your needs. Each one has several variants with different features and price points.
The HDS-5 has all the bells and whistles: internal GPS receiver, full chart plotting and available chart cards. You would need the Nautic Insight version for ocean charts (Lake Insight is $50 less).
http://www.lowrance.com/Products/Mar...pecifications/
The HDS-5 is going for $799 at West Marine. You would probably want the extended warranty as well; probably another $100. Defender Marine has them for $649.
http://www.defender.com/category.jsp...&sort=products
The Elite-5 is a little cheaper than the HDS-5, but it is harder to find.
http://www.anchorexpress.com/Lowranc...-p/104-001.htm