I would check closely to make certain that 49cm frame fits you properly, I am close to 4 inches taller than you but, really a 48cm frame is generally as large as I can go. That being said, it is as much about proportions as it is height. Indeed it is more important. You don't want to rush and wind up with a bike that is too large for you, that never pays off in the long-term.

Owlie has good advice about going ahead and checking out the other places as well. If you find something in a different size in another store that sings to you perhaps your preferred LBS can get it for you.