I would recommend the Pioneer DVR 111 drive as well, I have this one below which writes to all formats, including RAM
http://svp.co.uk/products-solo.php?pid=1055
However if you won't really use the RAM write function then the sister model the DVR 111D is also available and cheaper too !
http://svp.co.uk/products-solo.php?pid=1020
(If you know what you are doing I believe the above drive can be flashed to the RAM version as well)