I hope your biwire issue was resolved with Gonk's reply.

As to your original point about choosing the LFM1 vs. the LFM2, I personally use the LFM1 with a pair of Quad 11Ls and am very happy with the combo.

How do you like your 21s? I've heard great things about them. Are you using any of the other speakers from the L series for surround?
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Outlaw 970
McCormack DNA-125 (mains), Emotiva LPA-1 (surrounds)
Quad 11L (F&C) Wharfedale (R) LFM1 (Sub) w/ SMS-1
Squeezebox -> Behringer SRC2496 -> Musiland MD10 DAC
Sota Sapphire; Marantz 10B;
Video: Hitachi 42HDS52A; Oppo 971H
System Pics