When you buy your wireless mouse, it’s not a bad idea to consider replacing your keyboard at the same time. As I discuss in our latest page on wireless and mouse sets, you can actually save yourself a USB port by buying both together.
The biggest benefit (in my opinion) that comes from wireless technology comes with mice, as they’re the things we move around on the desk. The keyboard will usually be in a static position, so while you get the advantage of not having a wire, that’s less beneficial because you’re unlikely to find yourself struggling to move the keyboard when wired get tangled, or caught under clutter.
As with most things, if you can afford to spend a little more and get a decent quality keyboard and mouse set, there are clear advantages, but if the budget’s a little tighter, your money may well be better spent on a mouse only, and keeping your existing keyboard if it’s still working fine.