Check the dbdrag website for shows in your area as you should be able to hear some HDC's in person. There's a big show in Elgin, IL on June 5th and there will be plenty of AQ/DD sets up there since most of Team DOA is going.
I'm near Six Flags so if you ever get down that way let me know and you can hear my AQ set up and see what you think. That way your ears can decide if it's the sound you want and they're loud enough.
Very solid subs for the $$$ and will take a lot of abuse...