Got a Logitech HD Pro Webcam C920.
Camera works well for my purposes.
Mikes work well.
Don't get one of the old style round Logitechs all the PC people had in the mid 00's.
They're really cheap at Goodwill, but usually won't be recognized by a Mac.
Ideally get separate Cam n Mic - because if you're going be using it for Skype etc the combo cam/mic setup will result in sound echoing on the other end .. I use a Bluetooth mic ( iPhone ear style) and a Microsoft Xbox webcam... Just pair the BT ear mic to the Mac and plug the cam via usb and launch the app...