I'm jumping in with you and Adrian on the vote for JBL 2235's.There are other good options too; It's kinda like like choices for good cars and good engines. If it's cool and fast, then it's cool and fast. But I gotta say I love the pure clean power of the 22xx JBL's, and the ones that are tuned low make really great subs.
I'd definitely consider the JBL 2235 for 15" subwoofer or the JBL 2245 for 18" subwoofer.
They're really sweet!