Ive had about a million mice over the past decade.  One of my favs has been the Logitech MX518.  inexpensive, and performs great.  Had 3 of them in total.  Also had the g9, a razer, and even recently bought the Sentinel from cooler master.  But, i just got my favorite last week.  Roccat Kone.  Best feeling mouse ive ever owned, its like it melted into my hands!  Love the looks also.  Pure geekness at its best.
 
So.  There is my favorite.  What is yours, and why?

Thats one i never had to opportunity to try.  Gonna do it eventually though!

I love my Razer Deathadder. Had it for 3 years. Finally replaced it with Razer Mamba last month which is nice and wireless, but Deathadder is still my favorite mouse.

omg. I found a place....90 friggin dollars...I'm usin the MX-518 atm. I LOVE this mouse to death, but....I'm thinking about saving up hahaha. That mouse looks like something the doctor prescribed to me......

G9

Logitech Trackman, but I just replaced it with a Razer Mamba, got a sick deal I couldn't refuse.

My favorite mouse is the Razer Mamba.  It took some time to get used to because I was so used to my previous Logitech MX510, but once I got used to it, I haven't looked back.

I have tried a bunch... Logitech MX Revolution, MX11, MX Air, G9 and a few others not worth mentioning

I broke my hands in a car accident (not to mention a bunch of other parts ) so I NEED the right mouse for my hand or I get cramps and stiffness after a very short time (10 minutes)... so far the MX11 is the 'best' because it supports my hand better than the others so I can use it longer without problems.
The batteries give it a decent weight and the first set of Duracells lasted over 4 months...
However, the software is crap, as is their customer service

I am still on the hunt of the 'perfect' mouse.

Revolution

SharkmanBMW

I have tried a bunch... Logitech MX Revolution, MX11, MX Air, G9 and a few others not worth mentioning

I broke my hands in a car accident (not to mention a bunch of other parts ) so I NEED the right mouse for my hand or I get cramps and stiffness after a very short time (10 minutes)... so far the MX11 is the 'best' because it supports my hand better than the others so I can use it longer without problems.
The batteries give it a decent weight and the first set of Duracells lasted over 4 months...
However, the software is crap, as is their customer service

I am still on the hunt of the 'perfect' mouse.

I was expecting you to say the Revolution gave you the best support, but i guess it does have a high arch, but the Revolution is the best none game rated wireless mouse ive seeen.


you should get a padded mouse pad, that should help with the support and keep all everything straight so it's not putting tension on any tendons or anything, i have that problem, i have a bad wrist from typing to damn much and from work :| thats mainly why i droped the sidewinder, high arch, the mamba is a much lower profile mouse, got a good feel to it ;) 

@ eviling

I agree, the MX Revolution IS fantastic, so smooth, but my first one broke and while I sent it for RMA I bought the MX11 and when I got the MX Rev. back, it didn't feel as good - but it is superior in performance 100%.

Please feel free to suggest the "ultimate" mouse pad while we are on the subject

G9X

any mouse thathas 6 or more buttons with atleast  1800 or  above dpi thats $20 or less and wired. my 6 buttons mouse is 2000 dpi and costs only $10 the other version to this one works great

http://microcenter.com/single_product_results.phtml?product_id=0298042

I would really like to try that  Roccat Kone ...Reviews seem great.  Software looked awesome, especially for changing the lighting effects and colors.

I'm super accurate with claw grip mousies, I like the G9.