Subwoofer with Thiel 2.4s?


Hi all, I'm in the process of building a new system and am considering adding a sub to my Thiel system. I'd love to get one of the Smart Subs, but they're just too damn expensive to fit into the budget. Any opinions on the other alternatives? Although I do use the system for TV and occasional movies, I'm really only interested in 2 channel.

I've read good things about the REL Strata III, but would like to hear other's opinions on the available < $1000 (used) options.
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The SS2s do sound amazingly well integrated with my old Thiel CS2.4SE and the Thiel CS3.7s.

I have heard the JL Audio and it just seemed a tad slower off pace than the SS2s in the same dealer showroom

The SS2s don't call attention to themselves and just make the 2.4 and 3.7s into much larger speakers.

I think one reviewer said not to look at it as an expensive subwoofer but making a Grade A speaker (band limited) into a Grade A speaker (with full bandwidth) :)
Thiel has a new Sub out for this year, which is a little smaller in size than the previous model. I am looking to get that for my SCS4's.
There was an SS1 on here that just sold for $900. I was a day late on getting it. Really kicking myself over that one, but I had to finish my taxes to know what the money situation was going to be. Damn.
Anyone aware of the "charge the room" theory of subs? Although it might seem like another example of "audio mysticism", it appears to be real. Listen to music that has seemingly no bass with and without a (well designed, like a REL) sub. Without it the mojo disappears. Mandolin stuff illustrates this point...some say the sub sort of "charges" the air. Without the sub you could be experiencing a "mojo filter".