Razer Diamondback. I like the low profile, responsiveness and the button layout, with those l-o-n-g buttons...
I'm quite a fan of the intellimouse explorers as well. Of course, I'm currently using a MS Wireless Laser Mouse 8000, but only because it's the ONLY full-size bluetooth mouse I could find anywhere. Doesn't really fit in my hand the way I like and the scroll wheel is too easy to click sideways when you're trying to go for straight down (middle-click), but I wanted something full-size that didn't need a dongle for my laptop, and it does that. Then again, part of that is that I'm used to mice that don't have a side-scroll wheel.
Microsoft Laser Mouse 6000 (natural hand position version). Most mice these days are an excuse for a pointing device as they are ridiculously small/uncomfortable to be considered 'hardcore'. The 6000 is quite wide and very comfortable, although it's optics are rather weak.
Logitech MX510 on a SS pad, glides and feels perfect, fits my hand well as i have big hands with long fingers, wish i could get a G5, but they feel the same to me. A logitech G7 carbon fibre edition is on my wish list.
G5 2007 Refresh version! I've had that same combo as you for about 2 years, amazing mouse and mat, the G5 2007 is brilliant though with it's extra weights. My friend has the original G5 and the G7 (why they hell have they stopped making that?! Hot swappable batteries removed the headache! Gutted as I wanted one )
had a MX1000 for a long time.. then it died.. now a happy logitech revolution user. the other two pc's just have some random cheapo logitech mouses that came with keyboards.
Razer Diamondback for the gaming machine and a Logitech V270 for the Powerbook. Previously used a Logitech MX500 for gaming, until the button went a bit sticky...
Either a Logitech MX518 or Intellimouse Explorer 3.0. Had a Razer before and unless you have childrens hands (which would be wrong) then it just feels awful IMO.
i wish there was a corded version of the revolution. i'm on a mx1000 right now. for some reason, it won't charge if it's sitting in the charger properly. i have to have it partially-out, balanced precariously on a very odd angle before it'll charge.