I've got a Samsung ML-1750.

It's small, fast and cheap.

And when the toner runs out you can buy a jar of toner for £7 and pour it into to the cartidge. I'm on my 3rd jar now and it'st stil printing perfectly.
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...