hyperlight seems to fit what you're looking for, it's basically a viper mini wireless w/ some tweaks and improvements. I'm personally on an ancient Zowie FK1 for the time being but I don't mind. If you have extra cash to spare look at the S2-DW and ZA13-DW. They're not exactly like the viper but you can't go wrong with Zowie shapes and I've never heard of zowie mice having major issues, can't say the same for Razer or Logitech or any of the other major brands. Maybe Vaxee aswell? NP01-s might be up your alley