The Wolfenstein game you are referring to was probably "Wolfenstein 3-D"...it was really great in it's day. Last year they came out with "Return to Castle Wolfenstein"....anyone who loves these games and hasn't played that is really missing out. I was amazed at the realism and quality of "Return to Castle Wolfenstein".
Doom2 is almost endless, since zillions of new levels have been written by fans and posted on the internet. I still play Doom2 using the Doom 95 launcher. Doom 95 has better graphics!
Lots of levels have also been made for "Wolfenstein 3-D"...you can look them up. I tried it again about a year ago and it was still addicting.
Looks like the system requirements for Doom3 are going to be high. Got this off a site:
System Requirements for DOOM 3: A video card with at least 128MB RAM and Pixel Shader 1.1 support and a 2.5GHz CPU. Also DOOM 3 is expected to be on 4 cds and Multiplayer will include Deathmatch, Team Deathmatch, Tournament and Last Man Standing.
Minimum Ram will probably be 256K.