I have had numerous wireless keyboards and mice..... I have had better luck with the Logitech Bluetooth models than any others. But frankly, they are all a PITA....
..... batteries die, connection gets lost and has to be re-established. I'm back to using only wired units and much happier.....wireless is just too "high maintenance".
This is what I'm using now
Keyboard - $ 100 - Logitech G510 http://www.newegg.com/Product/Product.aspx?Item=N82E16823126100
Mouse - $ 55 - Logitech G500 http://www.newegg.com/Product/Product.aspx?Item=N82E16826104318
This is the best wireless that I have used but still.....too high maintenance ..... hate having the batteries die in the middle of something
$146 - Logitech MX 5500 Revolution Black Bluetooth Cordless Desktop Standard keyboard & Mouse Kithttp://www.newegg.com/Product/Product.aspx?Item=N82E16823126038