I think cordless mice have come a long way from their extremely laggy ancestors- but by definition the technology would have to add some lag time, however miniscule. I'm sure that on modern wireless mice, most people would never notice the difference- myself likely included.
I think the main question one need consider when weighing corded/cordless is necessity. Do you need a cordless mouse? I have two cordless mice. I use one for my HTPC, so that I could mouse from my coffee table if I need to without dragging a cable across the living room floor. The other, I bought for my netbook, to spare me from wrapping up and untangling a cord every time I pack or unpack it. If you're sitting at a desk with your PC just a few feet away, I really think it's pointless to bother with cordless mice. You gain nothing and possibly introduce some lag and have to worry about batteries conking out on you while you play.
Also, I absolutely can not recommend a ball mouse.
That's my.
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