As much as I hate to admit it, I must agree with Rahvin here: The Wonders at Your Feet is indeed the best DT-album-opener of all time, IMHO. Plus it is a great song as well.
Punish My Heaven and FreeCard are the only other openers that fit perfectly as such, IMO - Dreamlore Degenerate and Final Resistance would both work better later on their respective albums and the scream by Anders Fridén at the beginning of Nightfall by the Shore of Time is the worst part of the whole Skydancer-album.
And the "space-effect"-trick on both Of Chaos and Eternal Night and Zodijackyl Light never did the trick for me.
-Villain