Keep an eye out for kits. You can divide them into two categories: unifying and regular. The former are helpful because it is possible to swap out the included mouse for another (I did so with the 546 and 705), and the latter allow me to connect my regular mouse to a different usb receiver, making it portable and ideal for transporting with a laptop or passing on to a willing recipient =). Also, the common ones only function with their own receiver, and there's nothing to be done about it (believe me, I tried). The cost may appear exorbitant to some, but it's money well spent. To this end, I employ a pair (at work and at home). The original one has been around for nearly 5 years, and it's still going strong. I had previously used a low-quality set of defender Accent 965 (for $500; unfortunately, it is no longer for sale), and after a year the keys started sticking and the keyboard bent all over the place; I then gave the same cheap set to my mom, and her mouse wheel became unreliable when scrolling up and down. When shopping, I couldn't even feel other competitors' varieties because they were all disconnected =) Here, the keyboard won't need to be fed and will continue to function reliably for years if treated with care. It's more costly, yes, but it's definitely worthwhile. When it comes to the mouse, it's worth noting that Logitech only seems to put out good quality models for their cheapest (basic) and most costly (high-end) products—nothing jerks or creaks. The only drawback is that it is a bit on the small side.
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