core center is stupid, as mark said. y? cuase at core center you actually have more tail than nose, and that makes a ski ride HORRIBLY. i have had the best results at 2 back from center. its not much, but it gives just a tad more nose, and depending on the skis sidecut and location of the waist. they will ski plenty fine, and be more than adiquate for all your park needs. and actually, anthems are a lil stiffer than invaders, cuase its the same core, just wider, which equals more wood, more stiffness. but even after all that, i dunno if i personally would get either. both are kinda pussy skis, and suck balls anywhere but in the park. shit, skis that soft arnt even good on big jumps. yeah, they are cheap, but if i were you, invest a bit more and get a real ski.