So I've decided that I am going to upgrade my system and am either going to get 2 Sound Qubed HDC312's or HDC315's, they're DVC 1 ohm or 2 ohm and I don't know which to get yet until I know what amp I'm purchasing. They have 1500 watt RMS so I'm looking for something that can power both extremely well, I'll take a look at any good amps posted and consider them but I'm hoping to not spend more than $500 if possible. Also besides the big 3 should I consider any other buys like another battery or something? still pretyy new to this, thanks!