My goodness, so much to suggest. I'm a liveaboard on a 42 Nordic Tug based in Campbell River, further up the island. I love my life. For a liveaboard I'd suggest something in the 40' minimum if you are single. 200' + if you have a partner...
Kidding on the partner front of course.
For the price of a new Ranger tug there are many used options out there that will give you more living space and perhaps better sea capabilities if you're out in the straits much.
I find the gulf islands to be quite crowded in the summer, although pretty amazing. Because of that, I'm berthed in Campbell River which gives me quick access to Desolation Sound, and parts north, all of which are much less crowded. And of course you can always head south for exploring the gulf islands if you choose.
Good luck on your quest; you have some amazing options in front of you.
Campbell River BC