I've had the MX1000 laser and G7, currently I have the MX Revolution and it's by far the best mouse I've found sofar.
I got fed up with the MX1000 because I had to have it sitting just right in the charge cradle for it to take a charge.
The G7 was cool because it came with 2 swapable batteries, so you never had to worry about a dead battery.
The MX Revolution has a Lithium Ion battery that lasts the entire workweek without an additional charge! Big perk there. The other thing I really like about the Revolution is the thumb wheel, I reprogrammed that thumb wheel to keystrokes of CRTL-PgDn and CTRL-PgUp and I use it to switch between layout tabs. In all there are 9 buttons/functions on the Revolution, I have reprogrammed 6 of them for various tasks, really pleased.
I suggest you look into the MX Revolution, it may seem pricey at 100 bucks but in my opinion it's well worth it.