Saw Maiden at Rockfest last summer. Fantastic show, I was surprised at how mobile Bruce Dickenson was, he was all over that stage. For whatever reason, they played too quiet though! I'd have to say my favorite band out of the four days there was actually Five Finger Death Punch, lots of great crowd interaction, high energy playing, and they sound mix was very well balanced. Judas Priest is still on my to-see list.
I could list all the bands I've seen but it's got to be nearing 100 by now...
Mine: 2004 Subaru WRX Wagon: 116k, WRB
Gone: 2002 SVT, #1654
Hers: 2012 Focus Ti Sedan: 67k, SGM, Manual