I have only used Logitech stuff for the most part, but I found the Logitech wireless mouse with the ball had just about no latency at all. I switched to a Logitech optical wired version, which I prefer for regular mouse usage.
The only one to avoid, in the Logitech lines, is the Logitech wireless optical. I also have that one and the latency on it makes it unusable for games and *almost* unusable as an everyday mouse.
I also have the Logitech cordless desktop pro for an everyday keyboard, and it's served real well. It's only now starting to get a little "crunchy" and unresponsive, after a good 2.5 years of use. This is outstanding as all y'al know how much I use the keyboard. Obviously since this post is getting quite long and isn't really that much help.
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