Attached Link: http://x2000.rendervisions.com/

Well, it all depends on what you're looking for, doesn't it?;) I don't own any of the packages mentioned above, but I did snatch Stonemason's Level 19 Bay Doors freebie at DAZ and it's spectacular work, I'm highly impressed by his work (and jealous as hell;)). RDL7 either grabs you or it doesn't, it looks rather unique, which may not be a good thing since that makes it less versatile. Davo's Sci-Fi Construction Set looks pretty tempting, except for one flaw (sorry Davo): very obvious texture tiling. Maybe that bothers you, maybe not. Personally, I can't stand blatant tiling. But you can fix it in post, or even copy the textures themselves and rework them a little in Photoshop or whatever to create variations. But out of the box, the tiling is glaring even in the promos. Don't rule out freebies. I have some stuff on my site. It could use better texturing, but it's stuff that I haven't seen anywhere else and it's free to use in commercial art if that's your goal. And who did the Antares bridge set? lalverson, maybe? Incredible piece, anyway, and I don't think there are commercial restrictions on that, either (though I could be wrong).