I like alot of the Bleach Op, I like ash like snow from Gundam 00 Op, Naruto Op are also good... I have alot of Dgrayman Ops I like also... and some Yakitate Japan Ops
My favorite opening is Shakugan no shana's 2nd season 1st op...or Elfen Lied's op
but my fav anime song ever would be Claymore's Ending...Danzai no Sora