i386 is what you are after, if you want 32bit.
2 DVD isos? Theres is 8, with 2 update DVDs-
You only need DVD#1. Well, you dont even need DVD#1, CD#1 works fine.
Technically, you dont even need CD#1, the small images work as well. Just you dont load much from the CD, most of the files will come down via the net. Good if you have fast net connection, and are only planning on installing on one machine. Netinstall sucks if you have a slow conenction, or want to install on multipule machines.