I use a logitech MX revolution (i believe the revision/name is higher now) Anyway, there's absolutely 0 noticable delay, it has an extremely long battery life, which has a charger...so you dont need to purchase your own. Several programable buttons...glides extremely well, never gets that "dirt" crap on the bottom.
http://www.amazon.com/Logitech-Revol.../dp/B000HCT12O
This is apparently the newer version, but i dont see the side scroll wheel on it...
http://www.amazon.com/Logitech-Wirel...dp_ob_title_ce
Anyway, most comfortable best mouse I've ever used by far.