i think it's unfair to label symphony x as power metal. russell allen (one of the best non-growlers live!) never goes "Waaaaaaaaah!!" or "Yeow!" their guitar playing is much more complex, and in this respect they're more like hard-edged progressive rock.
Raziel, I bought V a year ago, and it rocked, so I paid $125 to import their other four. I especially like Divine Wings...
i looooove how Michael Romeo's guitar has such a "chunky" sound to it, even when he's playing arpeggios or ostenatos.