Which Servos for a Medium Hexapod?

Hello all,
I'm sure this question's been asked a thousand times but what decent servos can I get for under £5/$5 each?

Tough question I know, but I've had fun tinkering with mini SG90 and MG90 servos and it's time to move upward to the regular sized ones. 

Research tells me that MG995, MG996R, Futaba S3003, are good options but I really have no idea which.
Of course I want them to be strong but also move relatively fast.

Videos of this slow-moving MG996R robot make me feel pretty deflated about the whole prospect.

Are there actually any decent servos out there?

Thanks in advance :)

Slow moving hexapod

I would be very happy if mine walked that fast!!!