Need help on which board to buy

Using Arduino Project Guidance
#1

I'm going to hooking up a gps shield, 3 axis gyro,and also control 4 brushless motors. Will the UNO work? I would also like the sonar module as well if possible. Thanks

#2

Yes, but have you considered simply buying a copter board as such?

#3

I didn't know such a thing existed. Thanks. That looks like the better route.

#4