I don't think the Dahlquist DQ-10 speakers are known for playing particularly "LOUD," but the Wyred 4 Sound STI-1000 would give you more power, better sound, and you could replace both your amp and preamp. It's new list price is $2499.
If it were me, I'd consider looking for more efficient speakers that could play at louder levels. 350 watts is generally considered "high-power" already... and higher power than was typically available when the DQ-10s were designed. Meaning that you could start popping (burning out) the drivers with more than 350 Wpc.
If it were me, I'd consider looking for more efficient speakers that could play at louder levels. 350 watts is generally considered "high-power" already... and higher power than was typically available when the DQ-10s were designed. Meaning that you could start popping (burning out) the drivers with more than 350 Wpc.