I lean toward mouses for the plural. First, it grates on my nerves to refer to two or more computer mouses/mice as mice. All I can think of is real rodents. Second, a great deal of computer jargon has been invented, if you will, by computer geeks who weren't very good at English grammar or syntax--or meaning. However, the many goofy terms have become well-accepted. In keeping with that goofiness, I definitely prefer the goofiness of "mouses."