not many gaming mice do ps2 fittings any more the majority are usb 2.
you could try a ps2 mouse adapter but some higher end mice wont work with em.
look on microsoft or logitech sites you may find something sutable but honestly i dont like your chances.
i have a rat 7 contagion its nearly 1 year old and i cant fault it. i had to send the first 1 back but the replacement has more than made up for that. great little mouse and 1 of the best i have used.
if you want cheap but very good then the logitech g400 is worth every penny as is the kova+ if you can find 1 both can be had for around £30
(lol not true pravus. id read the posts. sometimes i get it wrong because im dyslexic but this time, no issues)...