Hmmm well the only one that popped into my head immediately was Windermere Manor, which you mentioned. It is really beautiful there though - I attended a luncheon/conference thing there a while back and I was thinking 'wow I bet this would be a great place for a wedding...' Bethany's right though, it's not huge, I'm not sure how big you need though... No idea re: price, sorry.
Beyond that I don't really know... but Bethany's already given you some good ideas it seems!
And again, CONGRATS! I'm just so happy for you!
ps I love your new profile pic! You have gorgeous hair!