I'll pile on the Maggie train here. Used Thiels can be awesome and can be had for 25% of their original price and there's a whole cult of Thiel users out there. I would also say that your choice may also depend on the type of music you listen to. Maggie and Thiels both are capable of great delicacy and are highly resolving speakers -- great classical and jazz speakers. Don't let anyone tell you Maggie's can't generate high SPLs because they very much CAN and will but require as has already been stated, large amounts of current to deliver.
