Tried my 32" Samsung TV as a monitor for boxing, wow looked really great, and a 'big' screen does aid with the immersion, but for some reason I got a really bad headache after a while. So I'm sticking to my trusty 24" dell monitor.

I was going to advice against using a TV as monitor at all, but apparently some people don't have issues with it. Keep in mind that a full HD tv will have quite a low number of pixels per inch, and might look really bad close up.