All of the above for me. If I'm already hooked on a show I try to keep up with it on cable/DVR because I usually want to watch them ASAP. I use streaming sites to catch up on things, and when it comes to re-watching, it's all about the DVD's/Blu-rays. I'll also occasionally pick up the box sets of shows I haven't seen yet on whim if I've heard enough good things about them.