Go for the 3.1 simply because its tweeter is still in production. Plus I don't like the the idea of buying a product that does a lot of aftermarket driver modifications. The 3.2's inverted Focal has now been superceded by the beryllium domes as used in the new JM Labs' products. Kharma does a lot of modifications to the titanium (of the 3.2) - however I would feel uncomfortable purchasing a product with archaic drivers that are out of production. Avalon went so far as to discontinue their Arcus speaker because of an availability issue for this tweeter. Now this is not to say the 3.1 sounds better than the 3.2.
