I'm a fan of Logitech mice (mouses?) too, as they just seem to feel better in the hand. I very seldom use a trackpad or track pointer (ThinkPad) if a mouse is available. Maybe it's my age, and not being a game player, but I'm just more comfortable with a mouse. All wireless these days, with the tiny usb transmitters.
Keyboards are pretty much the same story, but I have all laptops now (Apple, Sony, ASUS), as does my wife, so we don't own an external KB.
I tend to buy all these devices at brick-and-mortar retailers, as (IMHO) there is no substitute for holding and maneuvering mice, or checking out the feel and typing angle of keyboards.
"Not everything that can be counted counts, and not everything that counts can be counted." Albert Einstein