I use Bluebird 661 in 2wd and it's fine, and less than 30 quid. I would however agree that a proper KO servo (or savox although not had one myself) is noticably quieter and a bit more responsive. I bought a used KO 2143 or 2413 (can't remember which, the faster of the two) off flea bay for about 15 quid and I've used it in several cars and it's been faultless.
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