The thing to watch out for when buying monitors on ebay is dead pixels.
I'm very happy with the two AG Neovo X-174s I have, but those are 17" and not 19". If I didn't have them, I'd probably go with 20" Apple Cinema displays.
I know the 20" shows more pixels than 17s (which show 1280 x 1024), but I'm not sure that 19s do - i.e. the 19s may just give you a larger picture. That's useful if your eyesight requires it, but it won't be as sharp.