I personally voted for 4,5 and 7.
What I really disliked about most shooter is the lack of respect towards the damage the guns actually do. Enemies that can take 10+ shots to the head must have a good reason for it, either a reinforcement/enhancement/armor or force field to name a few examples...
I believe this song fits well - Tengo - Everything Is Out of Place
hilariously enough, this song goes well timing wise with the actual trailer. If you want to try it out, match 0:23 in trailer - 1:34 in bumped song and hit play on both from there.