Hey everyone i've been reading quite alot about the G5 and G7 etc.. and thought i'd post what mouse ive been using for about half a year now and i still love it.
Its the Microsoft Intelli Mouse Explorer 3.0, its laser and uses a cable. 
I bought this due to a limited budget and i don't really believe paying over 30 for a pointing device. 
 
I will recomend this for anybody whether just for browsing/general use or gaming. 
It is used by quite alot of professional gamers and has a very high quality laser.
Very confortable for your hand and has two extra buttons on the side for other binds. e.g voice comms or bomb (CSS). 
So if your on a budget and only have say around £20 to spend i say get this mouse. 
First ever review of any kind so try not to flame me.  
 
Reference: 
hxxp://www.microsoft.com/hardware/gamin ... px?pid=087