Jason Goes To Hell and Jason X are okay to buy (same with Freddy Vs. Jason)
Jason Goes To Hell inclued the UNRATED version, as well as the R-Rated cuts. It's already in anamorphic widescreen, and has a commentary with deleted scenes, and the trailer.
Jason X was only stripped of about half a second or something for the R-rated cut, so there's no need for an UNCUT release, it's as uncut as it'll ever be. It's also got and anamorphic widescreen transfer, commentary, and some documentaries, and a trailer.
Both come with DTS/5.1/stereo sound mixes. Don't expect new versions from New Line, pick them up.
1-8 are the theatrical cuts of the original films, and since they can be picked up for around 10-15 dollars, I'd recommend picking them up as well, if you're a complete rabid fan.
I knew Paramount would double-dip with these, but the way I see it, if they do UNCUT Releases, with extras...then I'll be able to say I have the original Theatrical Versions as well, which is what DVD is all about.