If the fans are keeping the temp where you need it, don't go with a chiller. If keeping up with the evap is a pain and you hate the look of the fans, look at a 1/4-1/3hp model for a 90. But, as alton said, you've got a whole other problem with heat being dispersed out the coils on the chiller. It's usually nothing your ac can't handle, but you will notice the room will be slightly warmer depending on your layout.