tv tuner box recommendation

I was just wondering if cheap tv tuner boxes vary a lot from higher priced ones such as the slingbox. I got a 42" monitor which does not have any coaxial cable input, and I want to be able to watch tv on it. Do you have any suggestions on which tv tuner box would be most worth the money? Thanks in advance.

I have seen both in action, I have noticed that the "cheaper" ones have a fairly poor image quality compared to something you would pay a bit more for.