"For our next game we're going to be using GURPS, it's a roleplaying game similar to Dungeons and Dragons but better suited to the world you're all interested in playing in. You can look over a free copy of the rules here
http://www.sjgames.com/gurps/lite/3e/gurpslite.pdf, but we'll be learning this rule system as a team so I'm going to take plenty of time for everyone to learn how to play."
A lot of the obstacle of getting players to try GURPS is the notion that trying GURPS is some burden that we have to ask players to take on.