First hand I have been to Talon looking to live aboard, I would not do it. The wife at the time said not just NO, but H NO! As for Gang Plank, it is very nice, but as mentiond before, the only way I was to get a live aboard slip,was to buy the boat and the slip lease.....they had an extensive wait list.
I too used to commute out of IAD, and lived in Calvert County, i was only making the drive once a month each way so it was not too bad, but over an hour and VA traffic makes the SF Bay Area look good, depending on how you want to boat Solomon's might be an option, but the further north on the Chesapeake certainly gives you more city type things, but Saint Marries county has grown expodentialy and traffic trying to cros the bridge at Pax river is even worse!
So I have taken drastic measures and am moving to FL!