If you haven't already figured this out, the designated size of an LCD screen is equal to the diagonal measurement of the viewing area BUT with a CRT monitor a portion of the picture tube is covered by the bezel/trim so you are losing nearly 2 inches. Thus a 15" LCD is approximately equivalent to a 17" CRT, a 17" LCD is approximately equivalent (viewing area) to a 19" CRT ... etc ...
Also (and unfortunately I think this sale ended this past Saturday) Best Buy had a
Westinghouse 17" wide screen LCD monitor on sale for $199 - they were sold out so I got a raincheck ($229 on web, currently back-ordered) ...
OOPS ... I STARTED MY REPLY BEFORE SEEING ZAN'S ANSWER ...