Check out Nick's Boats and Motors in Seattle. Check out the 1650 Lund "Laker" series. It is very stable and wide and Nick's is also a Yamaha dealer. Check the boat out at www.lundboats.com, it is new and appears to be the way to go if you want plenty of walking room. The boat is great for both salt and fresh water.
Check out Auburn Sports and Marine for The 16 foot Smokercraft "Lodge" series. This boat is identical to the above listed Lund. They are also a Yamaha dealer. Do yourself a favor and check these boats out, it may save you a lot of time looking. Jack