Not a R&P but you can't go wrong with a Moonlite crayford. I've bought two Moonlites and can't fault them except for their price. Feathertouch are another option, but I've never used one.
I've actually just ordered a GSO Linear Bearing crayford which gets good reviews and apparently ticks all the boxes (no slop or focus shift when locking, can handle high loads for imaging). Build quality doesn't look anywhere near as good as the Moonlite in the images I've seen of it (apparently it's better than it looks though), but it was much cheaper as well. I should have it today or tomorrow, fingers crossed.
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