hey OP, i can tell you that if you are a serious gamer (fps or MMO stuff) DO NOT GET logitech keyboards. I have the G110 and let me tell you, mechanical keyboards are 1000x better. I have owned this keyboard for more than a year and I use to have the steelseries mechanical keyboard and it better in terms of feeling and typing/gaming.
for mice i went from
microsoft intel 1.1 --> Razer deathadder (too big and cheap/clunky, waste of junk) --> Steelseries Ikari (bought from typeRnammer in RS
good for casual stuff but not for gaming because it is a really big mice that fits your hand perfectly) --> Steelseries XAI (great mice but i did not like these new type of mice any more...) --> went back to my microsoft intel 1.1 .... LOL wasted so much cash on gaming mice. I am a hardcore gamer though :/ use to play a lot of competitive counter strike and DotA 1