what's the best scaler for my consoles

[CRTGAMER]

and also when you buy a game and you see the screenshot on the back of the game, my games do look never as good as the screenshots ,not even close!

The box shot is a lot smaller pic then your HD. Take a 10x magnifying glass to the game box cover.

The reason no one is mentioning a setup is because we don't feel you should need a setup. What I'd recommend is you take some pictures of your screen so we can see all the "problems" you're seeing.

Concur, let's see how good or bad the images are with a regular camera, not a blurry cell phone snap.

Reiterate:

I'd hook things up as follows:

PS3/360 - HDMI
Dreamcast/Xbox - PC VGA connector (get a switch box if you only have a single input)
PS2/Wii - Component

You shouldn't need a scaler if you run those connection types.

Maybe ensure all the newer consoles are set to widescreen?
Go back to basics, check the HD screen settings sharpness, contrast, brightness etc.

[Hobie-wan]

and also when you buy a game and you see the screenshot on the back of the game, my games do look never as good as the screenshots ,not even close!

The box shot is a lot smaller pic then your HD. Take a 10x magnifying glass to the game box cover.

Also on modern games those screenshots will be direct screen captures from the development hardware, not a photo of a TV. So they're going to be perfect screenshots like you would get doing a capture while running a classic game in an emulator on a PC. If you look at screenshots on 16-bit and older packages, you'll see they are usually photos taken of TVs and usually look pretty bad. But as CRT said, even bad pictures can look pretty good when shrunk down.