Hi! I'm in Ottawa too and am thinking about the Dominican for about the same time of year in 2009. I was also hoping for a much lower price than what you've been quoted. Especially if you're having so many guests!
I was thinking that $1500 to $1700 max was what I would want to ask my guests to pay. Are you working with a travel agent? Which one? I haven't been to one yet (besides picking up brochures), but am about to start "interviewing" them. I met one TA at the Wedding Palace bridal fair in January that seemed like she would be helpful and knowledgeable, but she's in Gloucester and I'm out in Kanata, so that might be a bit too much travel if I have to meet with her very often. Although I guess a lot of it can be done on the phone or over e-mail.
Anyways, maybe we can help each other out on this or share some information.
~Lindsay