If you have to choose a rule book, here's what I use.
First, use 2010 rules for basically everything, but use the 2001 monster damage, special unit, and weapons section if you roll for armor. (I don't, so I just use the highest possible you can get on the die when rolling armor and add +1d6 or so to all weapons) If you want some cool stuff, the ancient tomes of 1998 and 2000 also have some pretty cool special units I think aren't in 2001 or 1998. I also have a huge list of stat cards here:https://www.dropbox.com/s/u3wxuy44uytrhgd/statcard%20word%20doc.docx
(I have even more but they aren't in there)