I like
Arc Audio, old school ppi art series - its what I run and have zero problems
Rockfod fostgate and JL are good quality mainstream brands as well.

this one
http://cgi.ebay.com/Rare-AUDISON-HR100-THE-AMPLIFIER-Originally-10-000US_W0QQitemZ230214959819QQcmdZViewItem?hash=ite m230214959819

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