Hate to sound like such a commercial shill...I point these guys out quite often around here whenever wiring comes up. But, they have great products, prices and service.
TerminalTown.com
They primarily cater to the experimental aircraft builder, but their products are equally at home in a marine environment.
They have crimp connectors w/shrink in every size/end you'll need. I find their connectors to be superior ro Ancor, and they cost significantly less. The shrink ends are about 25% longer than Ancor, and they seal up with less heat.
They sell
Tefzel Mil Spec Wire - if you haven't used this stuff, you're missing out. The insulation is much thinner than the typical marine wire you get at West Marine, resulting in much less bulk. It's tough as nails, and the slick coating and smaller size make routing it through tight spaces a snap. This mil-spec copper wire is suitable for marine applications - stranded and tin coated.
They also sell clear shrink wrap - a great way to make permanent labling. Simply print/write your labels on paper, wrap them around the wire (before attaching terminal ends), and slide a piece of clear shrink warp over them. Makes for a very professional installation.
Another place that somebody pointed me towards, although I've no personal experience with them -
SteinAir. They advertise Tefzel wire as well,
in several colors - TerminalTown only lists white.