I would mostly agree with Ashlanderz. Recently I bought an Epson WorkForce 545. It was by far the easiest printer to setup wirelessly with my MBA. It's a 4 in one printer for around $110. If you're looking for a fast printer or one that does great graphics, I don't think this model is the one you want.
We already have two other printers in our home for fancy jobs. I just wanted an easy to setup wifi printer that I can print from either MBA, my iPad or my IP ANYWHERE in the house and the 545 does do that greatly. I just wish it would auto turn on, but I don't think it uses too much juice in standby mode.