We flash all 360 drives LiteOn,BenQ,Samsung and Hitachi all for the very low price of £15 (if the console is brought to me for the flash)
To get your drive flashed just send me an PM on here or email/add me to MSN/Windows live messenger : ukflash360@hotmail.co.uk
First thing you need to do is check which DVD drive your Xbox 360 has.
There is 4 different types of Xbox 360 DVD Drives - But don't worry they can all be modified.
Remove the Xbox 360 Faceplate and look into hole #3 on the diagram shown below.

A white wire means that the DVD drive inside your Xbox 360 is BenQ.
A red wire means that the DVD drive inside your Xbox 360 is Samsung.
Plastic covering the hole means that the DVD drive inside your Xbox 360 is Hitachi.
A yellow wire means that the DVD drive inside your Xbox 360 is LiteOn.