both say 600 wrms@ 1 ohm.
Phoenix Gold X600.1 - Phoenix Gold Xenon 600 Watt Mono Amplifier
or
Hifonics BXi 606 - Hifonics 1 Ch 600 Watt Brutus Amplifier


It will probably cost more for 600w @ 4 ohm
Phoenix Gold Ti600.2 - Phoenix Gold Titanium 2 Ch 600 Watt Amplifier
or
Hifonics ZXi 6006 - Hifonics 2 Ch 600 Watt Zeus Amplifier

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Alpine CDA-9887, TUA-T500HD, CHA-S634, CHA-1204 & KCA-410C
Pioneer TS-A6981, 6 x GM-5100T
Kicker 2 x CVR15,
MBQ RCE-216
PG MX2
Soundgate LanStar1
PAC SWI-ALP