One word of caution, if the internal filter caused your sleep to be disturbed, the power head is going to make noise too. Also the air pump. Be sure if you get an air pump (probably the quietest choice of the two choices) that you get one that says it runs silent or quiet. If you just go get one and it says nothing about sound it will probably sound like a jet plane taking off in your room and it needs to be the smallest one you can get.
The quietest filter you can buy would probably be the AquaOne you showed me in the post yesterday that you were going to use in the AquaOne tank and it would not need an external pump. Just make sure it is completely submerged.
Rose
