I’m currently using a DeathAdder 2013. It’s a really good and comfortable mouse though with only 2 additional buttons on its side. Price is about $70 which is pretty average for a gaming mouse. If you need more buttons than that, you can consider any of the mice within the CM Storm series too, they’re much cheaper at $60 and below and have a minimum of 4 additional programmable buttons. I did a comparison at this particular site here so you could probably do the same: http://bestgamingmouseadvisor.com. Good luck with your purchase!