Darth Plagueis was AWESOME.....recommendations. - Edit 1
Before modification by Anonymous2000 at 18/05/2013 11:13:05 PM
I would suggest Cloak of Deception, which is the "prequel" to EI and runs concurrently with the end of Plagueis.
Also, the Darth Bane trilogy is very good.....and excellent ratings/reviews on Amazon.