JX PDI-6209MG 9KG High Precision Metal Gear Digital Standard Servo
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Strong, (relatively) fast, precise, quiet, good construction. The red strip you see is metal acting as heatsink. It comes with 5 arms and they are strong. Also in the box are rubber bushes and screws to mount the servo with anti-vibration... I guess since there's no instruction. I was skeptical at first since I couldn't find any review before I bought it but ended up very happy. Now I know where to look for a quality and cheap servo. Here's a video to show you how fast it is and the noise it produce on both standard 5v and high voltage 7.4v setup. https://www.youtube.com/watch?v=qijhCwKbaUA
This is standard size JX metal gear servo with quite good specs and price is great. I put this in my 1/10 buggy and it works great so far.