With that kind of budget, I'd invest in a MMATS D300HC (1200x1 at 2 ohms bridged). Probably one of the best sub amps available at the time. That 1200 watts is VERY conservatively rated, real world outputs can be up to 1700 watts RMS with a good electrical system. 2 Solos would hammer off of that amp
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1984 Mustang LX