Laptops Need Reliable 4GB DDR2 800/667 Laptop RAM

Hi Folks,

My Laptop runs 4GB DDR2 (2 x 2GB Sticks - Kingston OEM), one of them broke. Would like to replace it with a 4 Gb DDR2, my searches come up with Simmtronics / Dolgix online. Are they really good ones. I have used Simmtronics but last when we had 128/256 SD RAMs. If someone can point me to a 1x4GB DDR2 stick i would be great! I live in Chennai.