I've been putting off getting a Premiere (series 2 lifetime subscriber) for too long, and now that we just ditched our old bedroom tube TV for a new HD screen I think it's about time. The question is should I go with one of the refurb 45hr models for $79, or get one of the new 75hr ones for $150? How likely am I to want the 75hrs over the 45? How easy is HD upgrading now? (it was pretty easy as I recall in the series 2 days). Besides the hard drive is there any other potential benefit- chipset revision, or who knows what- to getting a "new" Premiere? I'm going to be adding the $399 LT sub, so saving $70 on the hardware may not be the hugest concern, but saving is saving. What do you think?