With your budget I would recommend staying away from a savox, even 2nd hand, especially the power hungry ones 1257/1258 as you will need to factor into the cost a ubec, another £10 at least. Take a look at the bluebird bms616dmg from hobby king. Nice and fast full metal geared servo, delivered from the uk warehouse for £20. I ran one for a few months with a glued up servo saver, no problems at all.
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