John,
I've been using a very similar Tenba P211 since 1983 and it's my favorite bag if I'm not carrying a huge load. It's unobtrusive, lies flat against the body, and isn't wide enough to bump into surrounding objects in tight quarters like wider bags do. It's also very easy to work out of with the flap folded out of the way.
I've considered buying the Domke, but my Tenba isn't anywhere near worn out yet. Tenba doesn't make a bag of this style any more, so I'd encourage you to go for the Domke. My son and wife have Crumplers, not the same as the 6-7 million dollar homes, but they feel more like big wads of padding with little slots for items and the Domke seems more like a working bag. I think you'd find it less bulky and perhaps easier to work from.
Lee
I may need to be more explicit about one point. The Domke will wrap around your body to some degree, a bit of give allowed by the material, construction, and amount of padding. I'd expect the Crumpler to be stiffer and hold itself more in line along the length of the bag because of construction and the amount of padding. That makes the difference in bulk a bit greater than you might otherwise expect.