So, I'm looking at getting a new wireless mouse and I'd really like some suggestions. I'd like a basic mouse that has long battery life and will work with or without a mousepad. I'll be using it for college and the less I have to haul to class, the better. I've looked at all kinds of mice online but the reviews are contradictory. Does anyone have recommendation that won't break the bank? (I'd like to spend less than $20).