I wouldnt necessarily say ID > Orion... I'll put my system up against an ID system...
I'll beat whatever SoundDomain has for Orion prices if you want. and yes 2,000 watts will not only crack the pavement, but also your wallet because you'll need a probable upgrade in alt and battery/batteries. Dont even think about getting a capacitor b/c they are wastes of $. Stick to a 600w-1000w amp and your elec system SHOULD be able to handle most of the peak draw for those nanoseconds the amp needs it.
One 10 + One 1000w amp = plenty for you sound crazy? its not. port the box CORRECTLY and you will not only get the output you want, but also a good sound that will rival and surpass a sealed box.