I just bought the color laser HP CM1415fnw all in one machine.
Staples has it on sale for $349.99 and will give you another $50 off if you give them a broken printer.
So far it's working great with my Mac and iPhone.
Don't bother with Airprint printers; instead look at Printopia or equivalents. It's software that allows ANY printer on your LAN to be used by iOS devices or other computers for printing. I think there's something called FingerPrint that'll run in Windows. Since you have several computers already, all that is required is that one of them run this software and you're good to go.
If you take this route you're not stuck with a limited range of printers (like HP's...and IMHO they lag for Macs), and you could even use a USB printer.
I actually purchased the Brother HL-5470DW for $193 no tax/shipping from BH photo video. The cost increase to me was worth automated duplexing/wireless and overall cheaper cost per page. Get the TN750 toner cartridge, and it estimates 8000 pages! Of course that is a high estimate, but lets say it is only 4000 pages.......that is only 2.25 cents a page! Half that if you get closer to 8000 per cartridge!
I actually did not want to fool with Printopia or anything of the like. Good reviews, but for simplicity's sake and not having to have a computer on all the time...I decided to go true AirPrint capable.