I am interested in investing in the Fading Suns RPG for the first time. My interest is almost wholly in the fiction rather than the ruleset. There are several different versions still available (listed here). Which would you recommend to a first time player primarily interested in the setting material and why? The ideal answer would also briefly touch on the the differences between the 1999 Second Edition Rulebook, the 2007 Second Edition Revised Rulebook, and/or the 2012 Fading Suns Player's Guide (Revised Edition).
Thanks in advance!