Looking for headphones, any suggestions?

As i will soon be going to college i think a good headphone system might be in order. My budget is in the $700 range for a headphones/amp combo. I listen to any type of music,from classical to jazz to rock and heavy metal. I've looked at antique sound lab's HB1 or MG DT OTL MKII for the amp (i like the idea of getting some tubes, and a headphone amp is the cheap way to do it), and senheiser 650/600's or AKG K701's for the headphones themselves. I'm open to any and all suggestions however, I could even go for a solid state amp if there's just an amazing one out there, but tubes jsut seem cooler (talk about a subjective term...) Thanks in advance for the help,
-Dan-