What's the Best Over-the-Air DVR?

Mike is thinking of getting an over-the-air DVR and antenna. What's the best one to get? Leo says he's a TiVO fan, but it is the priciest option out there. There's also ChannelMaster, which is a nice OTA and they don't charge for the TV Guide. Silicon Dust also makes the HD Home Run. But Leo is a fan of TiVO because it lets him ad-skip. 

As for Antennas, check out TVFool.com and AntennaWeb.org.