Comfortable Mouse

Hello,
I am looking for a affordable (< £40) mouse for someone who works a lot with the computer.

I did some research and am considering the purchase of Logitech MX518.

Has /g/ got any other suggestions?

Thanks in advance.

http://uk.youtube.com/watch?v=pwTQ61UcyK4

It lags like this on my whole network.

I have a linksys WRT45G router

SSID broadcast is off

WPA Personal security

Plugging into router directly fixes it, but its in a cramped space thus moving computer there is not an option.

Getting wired internet is not an option.

The spike still happens when i am 2 feet from the router with wireless.

Suggestions?

get a trackball fgt