I was thinking of getting a mouse and the chose was between Logitech G5 and Razer Lachesis. Yet I have seen this new mouse by a new kid on the gaming mouse block: Roccat.
Roccat Kone
There was a great deal of controversy over this mouse and if you see older forums you may notice different specs. This is because after their beta test (I know a beta test for mice?) they changed improved the mouse.
E.g 2000 dpi =>> 3200 dpi.
Only problem doesn't come out till October.

It's like a mix of Razer styling and Logitech functionality (i.e. weight cartridge)
Hopefull OCUK will get this mouse in for October as they already have the mouse mats.