Samsung 172N vs. 172T (and other questions re:LCD)

I was wondering what the difference between these two are? I think I may be in the market for a nice desktop LCD to use attached to my laptop when I'm at my desk from now on, and I don't know what to get. It's a laptop so I won't do much gaming (but it'd be nice to have something that I could hang onto for a while that I could maybe use later on). I have seen the Samsung 191T and love it, but I don't know if I want to drop that kind of money on it. The HP L1925 looks promising, but I'd like to see what people say about it when it becomes more mainstream.

Are the 17" Samsungs good? What is the difference between the 172N and the 172T? Is it just the DVI connection? If so, I'm using a laptop, so the DVI is no good to me anyways.

The Sony SDM-H73 looks nice too, but I don't know much about it (there aren't reviews that I can find).

I guess I just really want to know what people think of these and for the money. The 19" would be awesome, but they're just so expensive.

Sorry if this ran long... thanks for the help guys.

-SSwany