If the mods include an
external hard drive, this can be a great all-in-one media player for a pretty good-sized library of video (last I saw that mod could make it up to 2TB of sync-able storage). Just load up that hard drive (using an old computer with a compatible version of iTunes) and then put it anywhere. It will play movies off that hard drive just fine- no current link to a computer (or broadband connection) required.
If it comes with the 40GB internal, eBay used to have loads of (I think) 320GB replacements already formatted for that
TV. If you don't want external (much larger) storage, that might still be an option to fatten it up on the
inside. Here's the
step-by-step guide with pics. At an average of about 7GB for a movie, 320GB will hold about 35-40 or so movies (leaving some room for other storage). A 2TB hack will sync about 250-75 or so movies (leaving some room for other storage).
There are many other ways to accomplish much of the same these days but since you already have it, enjoy it. IMO: it has the most intuitive version of the UI, where your own movies will be in the "movies" tab, you own TV shows will be in the "TV Shows" tab, etc. If you've used the "Show" tag to group serialized movies like Star Wars and Harry Potter, it will show them as a single line item in the movie list menu; click into the "show" name to display the individual movies.
The whole design of it seemed to revolve around a person's own content instead of being a gateway to drive iTunes rentals & purchases. The press to buy/rent/subscribe is not so in-your-face as it is in subsequent models. One could buy & rent from iTunes but that seemed secondary- an option instead of nearly essential to making good use of it.
While I (have) own(ed) all of it's offspring, I still miss various features of that first one, jettisoned starting with the "2" and still not resurrected with the "5." Even the option to sync instead of stream was a terrific option- too bad the "2" & later did not make their USB ports more useful so that those wanting to sync could attach whatever size storage they wanted and/or leverage a NAS for "local" media storage. A desire to be able to turn off the computer still exists more than a decade later.
Build a playlist of internet radio stations (any, not just the Apple-endorsed options) and it will play them. It's not so deeply entrenched in the Apple ecosystem- in some ways it has much more flexibility than the modern models (minus third party apps of course).
And there's no joke about the heat. I believe a hidden feature of the first gen was the jiffy pop option.
OP says it already has the crystal HD card, so it can play 1080p.