Out of the three of those units the MARCH is the way to go. The Kalatel drops to many hard drives and doesn't have close to as many features and the Integral doesn't come close to comparing with either unit. I have several sites that have the March and the security staff love it. There is little or no maintenance needed on the system when installed properly, there is fast searching and downloading when installed on a proper network and there is full motion 120 FPS recording. I have one site that has a 103 of the 4310 DVRS and i rarely have problems with them .