Might aswell add me to the list too.
As to what Roster I'd have:
opening: In Flames (They have some good songs, and some really catchy ones. They're a great band however, not quite headlining material in the states.)
Mid-liner 1: DevilDriver (Extremely catchy lyrics and guitar riffs for the metal scene. Perhaps not as good as some of the other bands, which is why I'd consider them an opener)
Mid-liner 2: Soilwork (They've been around for quite some time now and deserve much more air-time than they get. They are very good at mixing their instruments together to come up with great melody in the metal scene, however because some of the songs just downright aren't that good, that's why they're #3.)
Midliner 3: All That Remains (Very very talented vocalist (Phil Labonte. I've been saying his name a lot since I've joined up here.) great guitar riffs, amazing drumming (Lots of double bass, which I love) and overall, a very chill band who, though they've changed band members for almost every album, the past 2 albums ("The Fall Of Ideals" and "Overcome") they've had the same 5 members. I feel this band is deserving of the top spot, if this were a list that consisted of only present living members.)
Headliner: Pantera (Since this is a together or not, living or not (RIP Dimebag) Pantera would be my headliner. They started out as yet another Glamm/Hair metal band, however, they soon realised they could go out on stage wearing whatever they wanted (T-shirts and blue-jeans...not spandex and over-done make-up) and their fans would stay right there as long as they played the same music. Eventually Pantera evolved into the leaders (In the US) of the many many genres of metal we have today (Death, Melodic, Power, Speed, etc). Overall, Pantera will live on (So to speak) as the innovators and leaders, and ofcourse, one of the all-time best metal bands ever. This is why they'd be my headliner)