I'm looking to buy some new subs for my car. RE? JL? Crystal?

There's a number of decent SQ/SPL subs in that price range. JL is pretty tried-and-true in the SQ/SPL market. I like those SSA's though...they have a treated-paper cone which typically gives you good SQ (I have found treated-paper and woven-fiberglass to sound the best) AND they're made in the USA. If I was looking to get a couple of fairly inexpensive 10's I think I would give those SSA's a try.