I know this post is a little old, but I just happened upon it. I had a surprise brunch at the Elm Park Inn. They were very accommodating, and had a nice little private room for our group of 25, which could have easily fit more. An excellent brunch buffet was set up and unlimited mimosas and bloody mary pitchers. Price was super reasonable at $25pp, dinner prix fixe options would be naturally a bit more.
Also check out Da Noi - they have private spaces and do nice prix fixe menus.