Ok I'm looking at the first one and will let you know soon.
The 2nd and 3rd links are the same thing.
Read these to help you get a better understanding.
http://www.cnet.com/4520-7874_1-5108580-7.html?tag=arwhttp://www.cnet.com/4520-7874_1-5108580-5.html?tag=arwEDIT--Ok I have looked at a couple on the site. The first one you picked seems really good. The only thing that I don't like is that it doesn't have a DVI input. To me, that's one of the most important things because all video cards made these days have 2 DVI outputs. But if you are not going to hook up your PC at all, then it's not a big thing. If you are, they give you an an adapter so it would work out anyways.
So it says that there is a component input, which is what you want since you want to hook up your DVD player. Your player should have that, but if your player has HDMI as well that's even better. HDMI will give you the best clarity for movies and stuff. look for this on the back of your dvd player and get the right cables for it.
It says there are 2 HDMI ports so, you can hook up your PS3 to one of those ports. If your DVD player has HDMI, then you hook that up to the second port. Now make sure that your Direct TV has component out or HDMI also otherwise you won't have any other ports to hook up to on the monitor. Tell me what you on the back of your box, just take a good pic if you have to.
Overall the monitor seems good for that size and price. I like
this one better because it has a lot more inputs which keeps you safe incase any of your products don't have high-end outputs.