The wizard tower in Draynor doesn't have that many wizards and I want blue tops and hats. Are there any places with lots of blue wizards like the tower west of Falador or the Varrock circle?

To my knowledge the only place to find attackable blue wizards is at the tower south of Draynor.

 

There are Dark Wizards that drop the blue hat which can be found at the Dark Wizards tower north of the crafting guild (P2P area)

well if you want hats betty in port sarim sells them

They have some in the magic guild if you can get in there.