What is above the toilet area? If you have access to any attic above the bathroom, look at Fantech fans. They have a very powerful motor remotely mounted with just ceiling grids (small like the size of a can light). Because the motor is hidden away, the fans are practically silent. I installed a 2 inlet system with one in the shower and one above the tub. Both have small integrated lights in the center. the amount if air they pull is amazing. If you cannot mount someplace above the ceiling, they also have motor units that wall mount outside, like up under the eaves. I couldn’t be happier with mine. I have halogen lights but they now have LED available.