For the mouse, I would say that a lot of it depends on what feels best to you. If possible, it would be best to be able to try out the mouse and see how it fits your hand before buying. I have a Logitech G9 and love it, but some people prefer the feeling of the G5. Razer has some nice laser gaming mice as well.
As for the keyboard, that's less critical. I love my G15, but if you don't need the screen or macro keys, then just get one that feels good to you.