What type of camera should I buy for my Lego stop motion videos?
There are a variety of cameras to select from for your Lego stop motion videos. Nonetheless, I would recommend any camera on which you can attach a remote release or cable release. See http://www.wexphotographic.com/remote-controls/b3059.
A camera with a changable IOS setting. 1/60 begins to stop motion, so depending on how fast the legos are going, you can set a higher IOS.