Between those it seems like the Sensei and the Deathadder would be the best options. Those are just very solid mice overall. However you could save a bit of money and go with a logitech g400. Its a very solid mouse with an extremely comfortable design. Check it out, http://www.amazon.com/Logitech-Optical-Gaming-High-Prec..., very good reviews on it overall.
I don't like the logitech shape at all ...
That's the question Sensei or Deathadder? I'm a FPS player, mainly COD and BF3 and I also play league of legends.
About the R.A.T, I've seen many reviews and I don't really like it.
What about the design of the logitech mice do you not like? If it is just the artwork, then I'd recommend the G500, or G400, but if it is the shell, then I can't help as I really like the shell on the G500.
I think you would feel differently if you actually held a g400 in your hand. So comfortable. Anyways, between the sensei and the deathadder I have no complaints about the deathadder at all, its my go to mouse. You cant really go wrong with it. I like the idea of the Sensei but dont have experience with it, from what it seems its solid though.