Toss up between IM, Waterbox, Planet Aquariums, Cade, Glass Cages. Red Sea would under no circumstances be a consideration. You just have to research and make a decision based on the model you want. IM and Waterbox have a fair number of complaints about poor customer service/quality but nothing approaching Red Sea. Keep in mind companies like Red Sea, Cade, Fiji etc. use proprietary and/or metric parts which I personally would avoid.
I have an IM100EXT and like it. I built my own stand so can not comment on that. I would not purchase a RedSea. This is my first reef tank. I was thinking about going custom but glad I did not. I will know more what I want for my second tank that will be custom.
