What I have:
Logitech MX510, MX512, MX518, G5, G400, G700, G9, G9x
Razer Lachesis, SteelSeries Sensei, some cheap OEM stuff I got for free
For OS usage my favorite is the G9 (scrollwheel side-click for switching tabs, yay) with high DPI
For gaming I prefer the MX518 / G400 (and perhaps the Sensei) with very low DPI