Sounds like you have enough reasons to change course. The RF amp looks solid and you'll want to drop the impedance low to get the full 500 Wrms out of it.
Sounds like:
Alpine Type-R
LINK
Incriminator Lethal Injection
LINK
Sundown SA-10
LINK
Skar - VVX
LINK
Rockford Fosgate Power -
LINK
RE SEX -
LINK
Once you get over 200 Wrms or so, it's going to be overwhelming... but all of these have solid tech and will go low.