Detlik: Thanks everyone, but one thing keeps bugging me, how far are HDTP, New Vision and Nameless mod finished? From some pages I read that they are only halfway finished (probably old pages, but I had to ask)
As Chautemoc said, HDTP isn't completed but does offer some updated weapon models/skins and updates a few characters like Anne Naverre, Gunther Hermann, etc......NewVision is more for world textures like walls/furniture/etc, and is still being worked on. NamelessMod isn;'t a vanilla game update but more a total conversion to a new game so only play that if you want some new gameplay other than the vanilla experience.
As for Shifter, it changes so much from vanilla gameplay(read it's FAQ) that i'd recommend against it if you haven't played through at least once on vanilla.
Overall, as in the guide link posted, i'd recommend HDTP, NewVision, Updated Deus Ex exe(it allows one to easily set newer rendering options much easier and without errors and can set high/wide resolutions.), and the DX10 renderer for antialiasing/anisotropic filtering support(by hitting t then typing preferences ingame to open a advanced options popup) and better game stability.
chautemoc: HDTP is in beta I think and doesn't seem like it's ever coming out, but it offers some improvements regardless.
Detlik: if its in beta will there be complications while playing? And do I understand it correctly that nameless mod kinda tells its own storyline?
Read my last reply above this one.....HDTP works great it just doesn't upgrade all the NPC/etc models so some main ones r nicer looking and the others aren't is all....still good to have imo)...and yeah NamelessMod is a different storyline/TC for DeusEx based on the TronLike inner world of the DeusEx internet forum.