i can vouch for the subs i set the link for... those champion series you linked, are cheap and about 80 on
ebay...
there was a thread on here and people were comparing them to sa12s, and i know they are good subs for the money as i've ran them... their numbers are a bit stretched but good subs, but if your going to pay 250 a sub brother your getting robbed!!!! 250 a sub AQ hdc3 all day brand new from AQ with warrenty and free shipping!!!
pioneer specs
Maximum input power3.500 W
Nominal input power1.000 W
ImpedanceDual 4Ω
Frequency response20 - 150 Hz
Lowest resonance frequency31 Hz
Sensitivity (1W/1m)90 dB
Woofer size30,0 cm
Woofer materialInterlaced Basalt / Carbon Fibre Reinforced IMPP™
Dual 4Ω voice coils: 2 or 8Ω
Voice Coil bobbin typePhenol resin coated glass cloth bobbin
Pole Yoke TypeExtended and Vented pole yoke
MagnetsDouble-stacked, high power
TerminalsPush-type
Recommended sealed enclosure14,2 - 28,3 litres
Surround3-Layer Fiber Woven Radial Surround
Thiele/Small Parameters