External optical enclosure for mid-2010 iMac

Hi. Need to replace the internal optical drive in a mid-2010 iMac running Snow Leopard. Rather than open the iMac I want to hook up an external optical drive in an enclosure. Found one at OWC that looks pretty nice. It's a tray loading Mercury Pro and uses an LG drive (WH16NS40). They also have just the external enclosure which you can fit w/ your own drive and I am considering that also although I'm not sure what drive would be an improvement over the LG.

Was wondering if anyone out there w/ my configuration was using either the enclosure w/ the LG drive or if they had hooked up just the enclosure fitted w/ an optical read/write drive of their own choice w/ success.