Multiple peripherial indecision

Hello everyone!
I am, sadly, quite indecisive when it comes to stuff such as this. You would think something that is mostly preference-oriented would be easy to decide... But I actually like a lot of different stuff. haha  

Most of the reviews for all of these items are good (except the ouroboros which isn't out yet  ). So I guess what I'm looking for mostly is personal stories/reviews, perhaps an in-depth review of something that is contrary to the good reviews (and isn't just a DoA or somesuch), or even just what you would choose for yourself (and why).

Background info about wtf I'll be doing:
-I game a lot. Mostly League of Legends. Gonna pick up Borderlands 2 and CS:GO, though. (staying away from Razer's MMO mice because I don't need all those damn buttons on the side in my way)
-I write and listen to a lot of music. (Which is making me lean towards the Sennheiser headset.. Was really liking the Tiamat set, but a couple reviews mentioned it might not be the best for music. Dunno anything about the Logitech other than wireless is neat ;] )
-And, I do all of these for looooooooong periods of time. I don't really do anything other than work and sit on the computer, so comfort and "health" is decently important to me.
-I'm sort of out of it, so if there's anything else you'd like to know, just ask and I'll post up. :]


~~~~~Headphones
http://www.sennheiserusa.com/noise-cancelling-headset-s...

http://steelseries.com/us/products/audio/steelseries-si...

http://www.razerzone.com/gaming-audio/razer-tiamat-71

http://www.logitech.com/en-us/gaming/headsets/wireless-...


~~~~~Keyboards
http://steelseries.com/us/products/keyboards/steelserie...

http://www.razerzone.com/store/razer-blackwidow-ultimat...

http://www.logitech.com/en-us/keyboards/keyboards/g19-k...

http://www.logitech.com/en-us/keyboards/keyboards/gamin...


~~~~~Mice
http://www.logitech.com/en-us/mice-pointers/mice/gaming...

http://www.razerzone.com/gaming-mice/razer-ouroboros