First off, don't worry at all about posting here. It's about speakers, not just home theater speakers.
I'm a little confused. Are you talking 2K for just a sub, or for just speakers, or for the whole setup?
As far as musical subs, Adire has a good reputation in this regard, as does ACI. I'm sure there are more, but this will get you started. I use a Hsu sub and like it, but probably will eventually end up with an ACI, just because I love the company and their products. I will disclaim that I haven't heard either firsthand, but am going by what others have said. Both are internet only companies and thus it is hard to audition. But, that's the risk I took with their speakers and I'm floated on cloud nine with the joy I get listening to them.
ACI is closed for revamping the next few days, but I'll link them anyway. I will say that the front speakers I have and enjoy so much are the Sapphires. Do a search here and at other forums and you'll read a lot of great things about both their speakers and subs. DO NOT rely on just what I have to say.
Anyway, a link:
ACI LINK