sq subs

This is my first post in a while, but here I am, looking for subs again. I'm looking for a pair of 10's in the SQ realm. They'll be run off of 500 watts at 2 ohms sealed in about .7 cf each. I need a mounting depth under 5 inches and I really don't want to pay over $250 per sub. They're...

is it good quality and sound quality oriented? or are they just new cheap junk? i noticed that it can play 16hz frequencies. are the ratings accurate? what other sq subs can play super low frequencies like that?