I'm close to Buying a DVR. I have two choices. Plain DVR with hard disk or combo hard disc + Blu-Ray recording devices. I'll probably opt for no blu-ray since it's on its way out and the price is almost 30% higher. I would like to eventually get the video from the DVR unit to my Mac for conversion to iPhone etc. Is it easy to get into these DVRs and say upgrade drives and/or send the captured video to a Mac?