If you have the funds, i suggest a kit, probably a 6000 would be fine for a 90. I have one arriving this week. I have had a 6000 which i upgraded to a 6100 running on a 180, which is also getting a multi controller and another 6100. the controllers are really nice. Now all i need is to get some battery backup power supplies to hook up to run the streams in the certain event of a power outage.