I'm going to get an external enclosure for my Lite-on SOHC-5232K CD-RW/DVD-ROM drive. I noticed some say they are made of aluminum but what are the ones made of that don't say aluminum, like this one http://www.meritline.com/usb-external-enclosure-5-25-cd-dvd-drive-hdd.html Should I spend the extra $$ for aluminum or does it matter that much?