the res of the new monitor is essentially identical to your current one, you're just gong to have more on the sides. Picture your current screen with 2 more inches in each direction. If your current screen is 19" then the 22", I think, should be roughly the same size vertically.
You can usually get them to display non native resolutions, which usually look like ass. The higher the native res, the better a non native one will looke. They're got more pixels to "fake" the non native res with.