I'm new to the dvr market and am looking for a dvr and camera system. I would like something that will record and play in realtime for all cameras, I'm thinking of only 4 cameras from the start but may expand so looks like 8 imput will be what I need. I will use some PTZ cameras outside I want high quality video imiges. I was looking at the pelco 5108 will this fit my bill or do you have any other suggestions any help would be appreciated. Thanks