for mouse, get a logitech g400.
there is literally nothing else you should get.
the g400 has a flawless sensor.
other "gaming" mice usually have acceleration or angle snapping. those things are bad. g400 is cheap. get it.
my keyboard is a cooler master quickfire rapid, with cherry mx red switches, and it's pretty sweet for gaming, if your motherboard has a ps/2 port.