why stop at 32MB cache, the 64MB cache drives are about the same price now. They are SATA III as well (6Gb/sec)
Shop at newegg.com, they usually have free 3 day shipping.
http://www.newegg.com/Product/Produc...82E16822136794
http://www.newegg.com/Product/Produc...82E16822136544
http://www.newegg.com/Product/Produc...82E16822136533
http://www.newegg.com/Product/Produc...82E16822136792
be sure to have a backup drive.
Newegg has a good deal on Re-certified Mybook Home external drives with the Tri interface (USB, Firewire, and eSata)
I bought a recert. mybook about 4 years ago and its still going strong, so i just bought another one.
http://www.newegg.com/Product/Produc...82E16822136528
if you dont trust a recert. then buy another Black or Blue Caviar and put it in an external case like this:
http://www.newegg.com/Product/Produc...82E16817173042
these even come with an eSata bracket in case your PC does not have a eSata port. I have 2 of these and they are nice. The fan is quiet, and can be turned off, if its still too loud for you.
And you should have a dock as well, these come in handy when you have several drives with different backups sitting on a shelf.
http://www.newegg.com/Product/Produc...82E16817182197
and if you dont already have it, get acronis true image home 2011. I suggest getting the Plus pack add on.
http://www.acronis.com/homecomputing...cts/trueimage/