Check the Broan website. They are now making some stylish models.
No matter how small the room, if it is just a toilet, 70 CFM would be OK. If there is a tub or shower, I would go for about 100 CFM. Less expensive models will be louder. If you put high value on quiet, I would just decide to spring in the $175 to $250 range for something in the 0.6 or 0.8 sones MAX>