Top Tier:
Keyboard: Logitech G810 (or G910 if you like the fancy stuff) , Corsair K70, Logitech G Pro (TKL).
Browns are regarded by most as the best switch in general, and romerG is a more stable, faster version of browns. It's great.
Mouse: Logitech G403 Wireless (It has no lag + No cable friction). If you want something lighter, go with the Scream One or a Zowie (Or wired g403 since its light)
Headset: I'd recommend just getting a nice headset (not gaming) and sticking a mod-mic on it.
Good for the price:
Keyboard: Corsairs new K63 is an amazing option for a budget, but it only comes in reds (which arent bad either way). Logitech's new metal plated keyboard is good for cheaper if you really want romer-g, just no media keys.
Mouse: Also not too sure about this one. Again just go zowie/finalmouse, or the wired version of the g403
Headset: Logitech G430