Ipad Keyboard

[MEIR613]

I am looking to buy an keyboard for an Ipad. I was looking around found a couple, but not sure whch ones are good or not.  These are the ones i was looking out. Any one with advice?

http://www.buy.com/prod/zaggfolio-wireless-carbon-fiber-bluetooth-keyboard-case-for-new-ipad-3/230797143.html
http://www.buy.com/prod/wireless-bluetooth-keyboard-for-apple-macbook-the-new-ipad-3-2012-2/236547251.html
http://www.buy.com/prod/ultrathin-mobile-bluetooth-wireless-keyboard-dock-front-case-for-apple/241834849.html
http://www.buy.com/prod/skque-premium-anti-glare-screen-protector-black-universal-leather-case/230956248.html