Nevermore?

You're contradicting yourself. "progressive" = "unique". To have prog elements, one must have enough originality to make it to the archives. Otherwise this site would be overrun with hundreds of same-sounding Dream Theater clones. To be progressive doesn't mean your band has keyboards, a super-fast guitar player and an operratic singer.

no its all technical, you need to be "more then metal to be prog".
for example symp x...they use allot of shred, they highly influenced by classical,  they use symphonic elements. concept albums and highly intelligent lyrics(POWER METAL).

Modern Progressive Power Metal (American Style) In a way these bands revived the music which had sparked the Progressive Metal movement in the 1980s. In the meantime the musical environment had changed a lot, for example neo-classical elements had been made popular by one Yngwie J. Malmsteen. This was influential for most Progressive Metal bands which were rooted in power metal. The following bands can largely be attributed to American Power Metal, although some are borderline to the Eclectic/Mainstream Progressive Metal bands.

and how many DT clones you know? maybe sun caged remind me the old DT, but i can think about any one else.

Zero Hour? never heard of them, but they all so in the archive.