Oh, I almost forgot!
I never watched it, but my brother got the OST for X back in middle school and played the heck out of it. I'm told the anime wasn't too great, but they had some sweet music for it!
Here's another track. I tried to convince the band to play this at a concert (we couldn't find the music arrangement and arranging it from scratch would have taken too much time)
As far as "battle music" (other than the above) I also enjoy Emiya's themesong from fate/stay night. Whenever you hear that, you know someone about get messed up something fierce!
(I'm humming along right now!)
Finally: it's not anime, but I also dig
this song which is very much in the same vein.
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Xenderwind, I liked the GirlDeMo songs a lot, but even the background music from Angel beats! was good. You should look into it if you have a chance. I'll have to listen to those songs you posted a bit (and move "mirai nikiki" up my "to watch" list closer to the front.)