I have been running 3 Samsung ML1200s at work for over a year now and they have proved very reliable. They have a small foot print so don't take up much room and are quiet.You will get about 3000+ prints out of a cartridge and carts cost about £50 per each.
Every couple of months Staples office supplies seem to have Ml1200s on special offer for between £50-£60 which is tremendous value, even if they are not on offer if you are cheeky enough to ask "where they not on offer at...." they will reduce the price (worked for me anyway).
I must add they are fine for low to moderate use but if you are looking for a printer for heavy use then you may be better of spending a little more on the printer to reduce your running costs.
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