there's a huge range of options out there, and depends mostly on your budget, and also how much space/weight you're willing to sacrifice for the subbox.
*cheap entry: pioneer TS-W307C, JBL GTO12
*good entry level: alpine type-S, JL audio W1v2, digital designs DD500 series, hertz energy series
*midspec: alpine type-R, JL audio W3v2, digital designs DD1500/2000/2500 series, image dynamics ID/IDQ series, boston acoustics G1/2 series, treo, soundstream, rockford fosgate P2/3
*highend: alpine type-X, JL audio W6v2, digital designs DD3500/9000 series, image dynamics IDMAX, boston acoustics G5, RF T1/2 series
i've not heard of that amp. in all honesty, it doesn't look anything special. the specs seem very overhyped to me. an amp capable of producing 3000WRMS would draw HUGE current, which is well in excess of what your car electrics could supply without MAJOR upgrades (bigger alternator, upgrade all underbonnet powerwiring, dual battery, etc). plus the sizes of the internal power supply cores are SMALL for what it claims and if that's all the stiffening capacitors it has, then that too is low. whilst i obviously haven't used or seen the amp, it seems to be more show than go. i wouldn't bother myself, and would choose a quality namebrand model that produces power you will actually need and use, that is lighter and fits into the car!
