Personally, I'm a troops guy. Especially given the slant towards large blocks of infantry in this edition, you are going to be painting a LOT more basic troops than anything else. Taking that into account, I mostly consider which army to collect based on the quality of the core. That's why I haven't been won over by the current strategy of leaving old sub-standard or mediocre plastic core troops as is, while releasing new crazy monsters and warmachines. If the new Dark Elves are the same old spearmen and crossbowmen with some weird looking flying chariot and a re-done centre piece (Cauldron of Blood I assume), then I certainly won't be tempted. I felt the same way about TKs (no new skeletons) and Empire (no new state troops). The Skaven release, on the other hand, was ace because of the new clanrats/slaves and stormvermin. I reaaaally hope that DE get new core infantry. If not, no amount of flying chariots and monsters is going to catch my interest. It's like putting a cherry on a stale cake or garish make-up on an old hag (sorry, Hellebron).