Personally,
In terms of a mouse I don't see myself using anything but the G502 at all for a while, 11 buttons that are all completely reprogram-able (including macros). Latest model has RGB (mine is currently just the old one in blue). It comes with weights that you can place in the bottom to get it to feel better for you... it's also quite large and fits really nicely in my hand.
For a headset I think that it really depends what you're going for. Previously I bought and adore a pair of wireless noise cancelling headphones for £230, the microphone on these was passable for calls but not gaming. Now I'm using a HyperX Cloud Stinger that is relatively cheap but also really nice, fantastic microphone quality and the audio is surprisingly great quality for the price.
