Thanks herminshs, kaysadeya, and rory. This forum really helped in understanding that $600.00 is not going to cut it, for a realy good 4 channel. Maybe not even $800.00, but I will check out your web site Rory, and if anyone else has any product ideas for my first DVR please post. I will not be getting any of the three that I originally listed. You are right, alot of them dont have brand names.
Also I did not want to get a PC based DVR. I read alot on PC v. Stand alone, and that debate to complicates me the consumer even more, but I think if I recall, the stand alones are less vulnerable to computer viruses, etc, and more more powerfull.