I'm looking to buy a DVR of some sort so i can finally get all the good racing when I want it. Also directv gave me a year of free movie channels just because they felt like it, apparently, so I'd love to be able to record movies to watch whenever.
I'd love to not pay full price for a box and I see plenty of tivos, DVRs, etc. on craigslist for prices varying from BO to $150. What should I be looking for? Can I just get a box be good to go, or do I have to set something up with Directv and/or pay a monthly fee to have this work? Also, which models are good, and are there any I'd want to avoid?

