I think second hand soho printers are the best option for that price bracket. Preferably the simpler the better, so I would avoid wireless and instead run an ethernet cable between the printer and the router (or switch, or access point... whichever you're using).
It's too easy to buy a shiny new do-everything printer which proceeds to bleed ink and eat paper, then kill itself. Particularly if buying from the ranges where it's cheaper to replace the printer than to replace the ink cartridges.
My reasoning is that I'm currently sitting beside a new £50 Epson BX300F and a roughly ten year old HP 2200DN which cost me something like £50 a few months back.
The Epson is a flashy waste of space. It'll photocopy after a fashion, and it came with a lot of free ink which it's almost exhausted after 150 pages or so. It wont print a black document because it's run out of cyan, even though it has black ink left and I've just replaced the cyan. It chews up paper if you try to load more than twenty sheets into the tray at a time.
The HP pre-dates windows XP, doesn't do wireless, colour, fax or photocopying. It has however printed 500 sheets on the second hand toner cartridge it came with, and has got every one of them spot on.
