Excellent choice! I've had my 28 for 4 years now and it's been the perfect boat for how I use it now. I've done a lot of mods and improvements outlined here in my various albums: https://public.fotki.com/ttschwing/c...ry-28-trawler/
The Westerbeke version is pretty rare from what I've seen.. Most had the Chrysler gas or Volvo 200 (mine). The WB should be fine as most of our cruising is at hull speed+ which requires far less HP than the Volvo has. If you have any questions, check out my albums and feel free to ping me. Welcome aboard!