For someone in your enviable position (not me alas) the significant factor might be your listening tastes. I don't know how important the near subsonic is for HT experience, but the only musical instrument that produces sound in the range that the LFM-1EX can cover more than the LFM-2 is the pipe organ. So if you're a pipe organ fancier - I am - the choice becomes obvious. I have also heard, but by word only, that reproducing capability below 30 Hz can give a more convincing sense of the size of the recording venue. Of course if you're mostly into HT little of this matters.
One other point: it's said that hearing is nondirectional in the bass, but I'm still more comfortable with a stereo system that keeps the two channels separate all the way down. That means using two LFM-2's as long as each gets its own signal in stereo.