Room: 16 x 18.5 how big of tv?

Yea I did mine to get best 2 channel with nothing in the way, it just was a huge bonus that the cheapest way was actually the biggest picture.

You really need to tell how far you are going to sit from TV rather than how big your room is, I can say I am in a 14x24 with speakers out almost 4ft from wall so I have 20ft left over, I sit 11 feet away and I run a 90 in screen with a Projector. If you have no issues with light control I suggest you look there, my 720P HD Panasonic unit and budget screen was only $800 and thats cheaper than most budget units of 42 and certainly above.
If you google HD screen size and seating distance it will give you an idea of ideal size to look for, with HD units and signals you go as big as you can within reason, not like the old days where you had to sit so far back for proper picture to avoid seeing pixels.

10-11 ft will never be too big for 90 inches and below with any HD signal, DLP Projectors can give some showing of pixels as you get cclose but even then the distance of 10 or so feet is a non issue.
Get as big as you can and you might be shocked to find how cheap Projectors are if you can control light and dont need to cycle it on and off many times per day................there is nothing like a great flic or even a concert DVD on a nice big screen.sports too!

Jim I did mine for $800 (720P Panasonic LCD) and a 90 inch $100 manaul pull down......for what it is and its use its pretty awesome. I still am surprised how few take advantage of Projectors.