I can't point you in the direction of an architect but I must say, as a student of architecture, I see one problem with your self designed plan, and that is that the bedroom nearest to the master has no bathroom nearby, it's all the way across the house. Not the best setup for convenience.
I did two quick plans in 3D Home Architect, the first is your plan, except with the Utility Room intact, it's based on my interpretation of what you said you wanted, as far as window placement and such goes, I was pretty much winging it
The second is more or less the same thing but with a 3rd bathroom, the kitchen is still large enough for a dining table but instead of next to the kitchen it would be in the middle of it
If you give me feedback on what you like and don't like I'll be happy to amend them, then you can print it out and take it to an architect who can work this out to fit your existing house
also....how thick are your walls (interior and exterior?)