For a 4wd buggy you need torque ratings of at least 7kg (most competition servos are closer to 10kg), speed is almost a secondary consideration so long as it's relatively quick (i.e. less than around 0.12s/60deg @6V)
I use Futaba servos, both are around the 9kg mark and approx 0.1s if that helps mate.
The PowerHD servos are good value too, I think they do a reasonably quick and torquey unit in the £40 is range new IIRC.
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