Is there reason that American workman goes with his NTSC when anyway you use LCDs and computers?
my gift to give you is PAL, if im right, sorry whoopsie if wrong.
You will up-it-up to 576 vs 480. 50hz vs 60hz i read is not problem if camera run off the DC adaptage that my be provided for you, but check your locals first.
Some the dvr and cameras supporting both in and out of the box. You flick wristswitch or flick mouse and step right up to higher resolutions? I only think so.
If it does do it and you flip switch and then charge customer 20% for upgrade, you dont have to give me even 2%. Just kidding. You can keep most of it.