The higher end usually has more bells and whistles and the price usually dictates what the system will include. Well, consider that non-linear systems have limitations. The first is memory. These systems digitize the video so it can be manipulated by the editor. The problem is, in order to get high quality resolution, it takes a substantial amount of memory.
Most systems come with enough memory for an hour of video at the maximum.
For example, I produced a twelve minute demonstration and used 17 gigabits out of the 18 gigabits available on our system. Another drawback is that these are computer driven systems. Know that in five to seven years your new system will be a dinosaur. In addition, you should be aware that non-linear editing will not necessarily save time in an edit session. Many people go in believing these systems will cut their editing time in half.