Optical Mice: Microsoft and Logitech

Microsoft Intellimouse Explorer 4.0

Some users will find that the lighter-weight offers more precision because of the weight difference. For some, however, the lightness factor and the price of $40 (50 Euros) represent attractive price/quality variables.

But if you want ergonomics that approach perfection and a multidirectional scroll button without the outlay of the wireless mouse, then go for it. Caveat emptor: this model only comes in one color, but it is a good one, especially for $40.