I use a Cherry MX-Board 3.0 and have done since I built my computer five years ago. Cherry Red switches. It's pretty bog standard, nothing fancy, but it's lasted this long with no issues and the clack of the keys is enough to make me feel like a movie hacker without waking people up at night.
I am considering getting a new one though, and I have half an eye on a Roccat Vulcan 120. It was recommended by some friends, and I like the idea of a backlit keyboard since I wouldn't need to keep my lamp on late at night, which sometimes bothers other people.
As for my mouse, I use a Logitech G502 Hero. Saw one on sale for £30 and since my previous mouse was dying I went for it. It's pretty nice, decent heft, plenty of buttons, and you can program it how you want. My only gripes would be that the mouse wheel can be a little loud, and it was a few pointy edges. That last might not be an issue for most, but I have a habit of rubbing my fingers along my mice (mouses? meese?) and after a while my fingers get a little sore. But that's me being a tit. It's a pretty good mouse, especially if you find it on sale like I did.