What is the best wireless printers for the iPad?

YOu may also want to consider that some printer manufacturers have apps you can use to print, and there are third party printer apps you can also use. So really, in theory, any wireless printer will work with an iPad. If it's airprint enabled it'll work natively, if it's not air print then you use their app or a third party app, so you can potentially expand your search to find a good printer that meets any specs you have (speed, or quality or ink cost) and then work with it to make it print with your iPad.

See requirements for AirPrint and printers that support AirPrint here:

http://support.apple.com/kb/ht4356

I love my canon pixma and it works flawlessly!

Highly recommend the Brother HL-L2340DW for wireless printing. It easily connects to my iPad mini and prints my documents flawlessly. Since it's a laser printer it prints super fast which is great!