The Tivo remote, to me, is so perfect it needs no changes.

I've been looking around, but am a bit confused between the various TiVo models. The sony remote looks very different from the philips remote, and then there seem to be cable vs. satellite differences. Are there any hidden differences besides appearances between the various models?

Some of the ebay offerings look kind of fishy too. A person who is selling a sony svr-2000 was bidding in another auction on the identical model.