Kingston KVR1066D3N7/4G 4GB PC3-8500U 1066MHz 240pin DIMM Desktop Non-ECC DDR3 Memory - Discount Prices, Technical Specs and Reviews
[Kingston KVR1066D3N7/4G 4GB PC3-8500U 1066MHz Desktop DDR Memory Full Technical Specs]

I cannot fault this memory, although I would say if you are thinking of it and your motherboard is fairly new then go for the faster speeds, they will be just as compatible only faster and if you look around for the same price too. These and their faster counterparts are perfect on ASUS motherboards, in all my time building systems I have never had a single problem.