I've used Logitech mice for donkeys years and they never break.
Saying that, i have just bought a Razor Naga Hex which i like so far. Its smaller than the logitech mice so its taking a bit of getting used to, but i love the 6 buttons around my thumb. I've also heard good things of their durability. The online part of their software is only if you want to load/save settings, doesnt need to be always online.
If you had good experience with Logitech and wanted an MMO gaming mouse you could have go with g600.
Logitch mouses are maybe a little overpriced but they are usually very durable.
http://www.gamefaqs....373-pc/68834179
http://eu.battle.net...pic/11252435273
http://www.mmo-champ...s-of-durability
My very simple, non-gaming Logitech LX3 mouse lasted for 5 years of "heavy gaming" 
My Razer Lachesis had broken twice in 6 months. Razer Lycosa keyboard was even worse. After month it felt apart into a pieces like it was made of lego bricks.
tldr : If you don't care about paying a little more and there is a choice, go with Logitech.