I assume you're running passive rather than active--if you aren't familiar with the term, you're passive. And assuming so, that's one of several good options in that $250-500-ish price range. You should be able to pick up a legit set for well under 450 online though.
DIYMA.com - Scientific Car Audio - Truth in Sound Quality is a good forum for car audio speakers, and you can just search for HSK reviews. Or research for a price point and recommendations. Google it as "site:
diymobileaudio.com" (or "inurl:") and you can include "350..500" as a search term so it googles for any number on or between that range.
Here's one comparison thread I got from a really quick search:
Hertz HSK 165.4 vs. Massive Audio Ck6 vs A/D/S 346cs review - DIYMA.com - Scientific Car Audio - Truth in Sound Quality