What ever printer you get, don't get one that feeds the paper by gravity, ie HP 1100, 3100, etc. The HP 1200 has a bottom paper tray and feeds the paper much better. We had purchased about 100 HP 1100s here at work, and none of them lasted long enough to replace the toner cartridge.
I currently have an HP 1220 (that's the 1200 with the scanner) and have found it much better than the 1100s or 3100s I had before. It even scans in color, even though it will only copy and print in b&w.
While trying to identify replacement printers for the HP 1100s and 3100s, we evaluated comparable printers from Lexmark and Xerox. They weren't much better and the consumables were much more costly.