Best Arduino for a quad copter ?

Hi
i have Arduino UNO and i'am comfortable with it
the thing is that i'm planning to make a quad copter so i'm trying to minimize the weight and size as much as possible
so i'm searching for a very small Arduino that have same capabilities as UNO as working with is simple as the UNO

what do u recommend to me ? any ideas / suggestion are highly appreciated ...

What does this Arduino need to do?

Well of course, the Pro Mini is about the smallest board and is in effect, a UNO without the USB interface.

But for a quadcopter, you also need the ESCs and the 10DOF sensor board, and are probably better off simply buying a full control board.

PeterH:
What does this Arduino need to do?

motors coontrol , camera and wifi

Video + Arduino tends to not work.