Hello all. I am a Fish Biologist in No. California and I am designing a video system to record fish passage thru 5 fish passage chutes in a fish counting weir. I need help deciding on the proper dvr to record high quality footage from 5 underwater cameras as well as 4-5 security cameras. I want to record 24-7, 7 days a week for a few the first year after install. I need to be able to take the footage from the dvr on an external hard drive on a daily basis back to my office a few miles away to review the footage on a computer. What compression system would be best, mpeg4 or H.264? What is a good brand of dvr to purchase? I want a quality unit and can spend the $ for a good dvr. Would I need viewer software for the review computer? Thanks for the help.