Had to jump in on this one...even made me register!
I write articles for ExtremeMhz, and I've gotten to check out a LOT of mice over the last year. I'd agree that a lot can be argued between the Logitech and Razer camps, but ultimately it depends how you play. I haven't gotten a chance to play with the Copperhead yet, but I did sit down a bit with Robert "Razerguy" Krakoff at CES this year and he swears that I'll be getting one for review. The new software package for the Copperhead is impressive, and it's the only mouse out there that will store multiple configurations within the device itself without the need to tweak it every time.
For those of you that don't like the price, Razer will be coming along with a mouse called the Krait later on this year. It looks similar to the Viper, but the guts have been totally redone and it doesn't skip like the Viper does (my G/F currently uses and loves it, but she's far from what I'd call a hardcore gamer). I don't recall whether or not the Krait will have the memory like the Copperhead, but for the anticipated $30 dollar price range I kind of doubt it.
If you're not willing to wait on that, you might want to check out the A4 Tech X-710. It's cheap, has on-the-fly resolution switching, and tracks pretty nicely.
The cheapie pad I've been recommending to folks lately is the mygamecontroller.com Black Knight XLH. Hard plastic surface with a rubberized bottom...doesn't slide around at all and works great with all my Razer (Viper, Diamondback, and Plasma), Logitech (MX518, MX1000), X-710, and Optorite ML-101 mice.
Hope all that helps make up your mind!