Rolling Stones are THE band I just can't get my head around. I always hated The Beatles but finally saw the light when I was 20-21 years old.
Iron Maiden. I'll never get it I'm afraid. I grew up on Metallica. That's my idea of 'badass'. For vintage rock 'n roll I'll turn to Led Zeppelin or Deep Purple, and for more 'pure' metal I'll spin some Black Sabbath or Rainbow. And of the NWOBHM bands I definitely prefer Judas Priest, although I don't really care for them anyway. Maybe NWOBHM is just not my thing, despite Metallica being hugely influenced by those bands.
Hm...coming from a heavy metal background already and speaking of "badass", here's a few songs you should check out. Where Eagles Dare, Powerslave, Wasted Years, Fear of the Dark for early stuff. For later stuff check out The Wicker Man, Brighter Than A Thousand Suns, The Reincarnation of Benjamin Breeg, The Final Frontier and Eldorado.
I should also mention that Iron Maiden was the band that got me into Dream Theater. There's a lot of prog elements in their music and once you get past his voice (if that's what is bothering you), you'll find Maiden to be an amazing band.