Is it bad if a professional camera has a couple dead pixels when you up the iso to 1600?

I'm trading for a camera to a guy who lives across the country. He says that the only problem is that when the iso is put up to 1600 there are a few dead pixels. Is this a big issue or would it not matter very much? It is a good deal for me because his whole setup new costs around $1600 and what I'm trading him only sells for $500. The camera is a Nikon D90 w/ 18 - 105 lens and a 18 - 200 lens. I'm trading my Planet Eclipse Ego 9 for the camera.

Dead pixels happen to almost all digital cameras. If they really bother you, you can send it to Nikon to have them mapped out. Also it is very easy to edit them out in post processing. I'm wondering which 18-200mm lens. If it's the AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II, that's an $850 lens. But if it's the Tamron AF 18-200mm f/3.5-6.3 XR Di II LD lens, it's only $300.

The higher the ISO value, the more likely you are to see digital noise in your picture.

You are probably seeing noise or you are just seeing a weak pixel that looks worse when the ISO is set too high. Maybe there are a few dead or dying pixels in the camera but, if you don't turn the ISO all the way up to 1600 and keep it at 400 you might be all right.

I think you are getting the better deal, trading a paintball gun for a camera, anyway.