Bought an HP 8500a Premium-works perfectly!
So... my home printer died - ribbon cable severed from the ink cartridge carriage. Wasn't my favorite printer ever, but it worked - usually. I wasn't planning to replace it, but thougth since I was, I wanted something wireless for my work laptop when I bring it home, and, of course, for the iPad.
I had read that the firmware to allow Airprint to work wasn't going to be updated until December 27th, but the HP info changed and it was available December 9th. I didn't know that - just figured I'd wait until after Christmas - needed a printer now. When I set up the printer on my wireless network, it checked for new firmware and asked if it could download - I let it, and was pleased that the iPad now works with it.
THe 8500a Premium is their top printer in that line - much more robust than the Envy that I also have (office). The 8500a line has individual ink cartridges, and the Premium adds a 2nd paper tray so legal can be loaded in at the same time - or cover stock, or whatever.
I had wanted to get the lower Plus model, but no one had it around me, so I looked online. NewEgg had it for $299 - $200 off list, and it includes extra color cartridges.
The printer is great - no issues at all. The Envy is also nice, but for much lower volume.