Those look like great subs for a cavalier. Polk is usually good stuff!
MTX TC8001 would give you a 800 rms @ 2 ohms.
750 canadian or 308 US. Make any sense to you?

I went looking for pictures from my old cavalier, sorry, can't find them.

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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