Yeah, I thought about another Tivo (already have a "lifetime" Series2 sitting unused in a closet), but paying for a listing service I can get free elsewhere (embedded in OTA signals) just doesn't sit well with me.
The free PSIP information offered by broadcasters is typically limited to 24-72 hours, and is not always reliable -- for now, at least, it's not something you really want to depend on in a DVR. Dish Network licensed the commercial TVGOS service for the DTVPal DVR; the cost of that information is factored into the price and feature set of the product.
Last year, TiVo allowed customers to transfer lifetime from their Series2 to the TivoHD for $199. Unfortunately, no such transfer offers are currently running.