If you really need colour, then go for it. If not, I would get a Black only one. Colour lasers are incredibly expensive to run compared to a black laser. Ex workgroup or doctors surgery printers are good to get. I have an HP 1320 which I get at least 4-5K pages pages to a toner cart (£18 on ebay for a compatible). Absolute workhorse!
I also have a samsung colour laser (CLP-310) and replacement toner is around £80 for a full set of 4. Barely manages 300 - 400 pages of colour (I only use it to print colour labels!).