Thanks to all for the input. Will probably order some in the new year, so still open to more suggestions. Leaning towards trying the Grado 60's for a true open headphone next to the 240's, the "standard" semi-open headphone.
I think you'll probably like the Grado's. Grado's have long been known for a great sound for rock-ish types of music (guitar-oriented music) so they work really well for the Axe. They wouldn't be my first choice for different types of listening such as gaming or watching movies, but for hard rock/metal music they're tough to beat, especially at their price range.
If there's too much high end, just roll it back in your global EQ. That's what I do, though I tend to like tones that are a little more dark. They seem to translate well to my monitors too.
A lot of people like the Audio Technica M50's, but I passed them up because I like open designs and they seemed too hyped in the lows for my taste.