thor220 :
Monitors are made for close range viewing and are typically of higher quality. You can expect better color reproduction, much lower response time, and better sharpness when viewing from optimal range.
If your not a student, professional or gamer you can get away with using a monitor.
I have a 27" samsung monitor, and a friend has a 27" samsung tv, both same 1920x1080 res. We use at the same distance, and I can see quite an improvement on mine regarding sharpness.
Anyway, if you're spending some cash to get better image quality, I would personally get an IPS 27 2560x1440p monitor. You'd have a huge boom in quality. The only downside to it is that you'll need a decent pc to play games on it.