I know what you mean, I do have a 15" monitor that I'm not using right now If you want It. However, wal-Mart (yes i know) has a pretty nice 17' flat screen for under $100.00. It seems to be ok For what I do here at home, Talk to you guys, Play a few games, etc.
but yeah, It sounds like you may want to invest in a new monitor. Heck I'm still running an old Compaq V70 17" myself, But I'm thinking about getting a new monitor anyway.
I can recall some advice that I believe Dave, or The Beast gave me awhile back. Don't worry about a brand name, Your not going to see much differance either in Dot pitch, or Refresh Rates from most Monitors. So I guess, unless your epileptic, I wouldn't worry too much about the monitor, Just get an affordable one.
Of course If you can get a 19" go for It.
Stephen