If your looking for high end servos that are durable and strong here are a few. Personally I use the Futaba but AIR or JR are great as well.
http://www.carolinasrc.com/Webstore/...idproduct=1340
http://www.carolinasrc.com/Webstore/...idproduct=4271
Both stronger but slower....
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http://www.carolinasrc.com/Webstore/...idproduct=9980
http://www.carolinasrc.com/Webstore/...idproduct=4167
Almost as fast...