A bit more information would be helpful in answering your question properly:
Where is the TV being used? Is it there a PC nearby? Several people use that TV as a monitor, so I don't want to make any assumptions.
There were/are several Set Top Boxes available (I picked one up a while back (discontinued) from Radio Shack for less then $100. If you are using that TV with a PC, then you might want to consider an HDTV Tuner card. I have used both a STB and a HD TV tuner and both performed similarly. Both grabbed the same amount of channels and both had great quality. The STB was more straightforward and the HD Tuner had more potential (DVR, Burning TV to DVDs, etc...).
The bottom line for me was this: if it was for me alone, I would have used the HDTV Tuner card. If my wife/children were gonna use it, I would have used the STB.
A final note: I talked about both of these in past tense for a reason. My cable company has offered me a 'package deal' where I can get HD channels, phone, and internet cheaper then what I was paying (not a promotional rate either....). So, now I used the cable companies box for my TV.
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