I'd suggerst picking up a Mohawk Thunder. It's wicked cheap, stiff, perfect faceoff head due to it's shape, pinch, durability, and big ass sidewalls. Also, YES it is legal for field play.
There's also a straight version of the head. Honestly, I picked it up for 40 bucks and it's a killer faceoff head. It's better to have an indestructible head for FO's and if you don't like it for the rest of gameplay, you could use your regular stick.