As for euro-dance, hands down would be;
Cascada - Everytime We Touch
For space-themed music, I prefer;
Samael - Passage, Exodus, Eternal, or Reign of Light
...And Oceans - A.M. G.O.D. (Allotropic/Metamorphic Genesis of Dismorphism)
For energetic music, I prefer;
Children Of Bodom - Folllow The Reaper
System Of A Down - Mezmerize
Megadeth - Rust In Peace
For music that makes me want to rip my head off and shove it up my ass, I prefer;
Naglfar - Sheol
Dark Funeral - Attera Totus Sanctus
Slayer - Reign In Blood
Wintersun - Wintersun
Dimmu Borgir - Puritanical Euphoric Misanthropia (sp?)
But my all time favorite would have to be;
Sonata Arctica - Reckoning Night
If you dont like this, youll never like power metal.