If you are not going to upgrade your sub later for a higher rated rms sub @ 1 ohm, then for about the same price and wattage at 2 ohms you may want to consider the T500-1bdCP which is smaller compact and the higer line than the punch series amp and have the same rating at 2 ohms.
http://www.onlinecarstereo.com/CarAudio/p_23922_Hifonics_BRZ12001D.aspx
cheaper here http://www.vminnovations.com/Product_4514/Hifonics-Brutus-BRZ1200-1D-1200W-Mono-D-Amplifier.html
even cheaper here http://www.carstereogiant.com/Hifonics-BRZ1200-1D-p/brz1200.1d.htm