for that money you won't get anything particularly fast or strong. Not new anyway. So it may be worth sticking with your old unit. I have a 20 year old KO servo that still works fine and has pretty good speed compared to modern ones, just not quite as torquey.
The bluebird servos are cheap and have a fairly decent spec for the money, but they are around £25+ new.
You could put a wanted add on here and see what offers come in for a second hand servo?
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