1. I would advise you against those 3Tb Green HDs; if using WD, go for Purple or Red. Besides the computer, you need the network equipment and cameras.
2. Any network topology will do. You probably want to look at a switch with POE ports to make it easier, so the switch can power the cameras, and you will only need to run one UTP cable to each camera.
3. W7 x64 will be ok. i can not recommend on the software.
1. Thank you for your kind and quick response. OK I will switch to better HDDs.
2. And thanks I understand about the network switch I just need to make sure it is POE. Another question here is, do all IP Cams use UTP cables? Is that similar as Cat5e?
3. Anyone else wants to comment on software? Or should I move to the software section of the forums.
Again Thanks and sorry for the noobieness.