We are better off here as you will be able to get input from many more people.
I did some digging and my recommendation stands for an external. Over there, currently, the Liteon 1635 would be best. I suggest here:
http://www.overclockers.co.uk/acatal...RW_Drives.html
I got my NEC 4570 from them.
Also see here for comments on the 1635:
http://club.cdfreaks.com/showthread.php?t=154554