vandersteen 2sigs to magnepan .7 good move?

What qualities do you prefer? I ask because I've owned the 2CE signatures, Maggie 12QR (pretty close to the .7) as well as the Maggie 1.6s. 
If image depth is an important factor, the Vandersteens win by a mile. Another plus for the Vandies is bass depth. While the Maggies, both models, present exceptionally clean bass, the 2CEs go deeper. I will say though, the Maggies go plenty low for most music. And that clear, clean bass is intoxicating.
For me, the 3 dimensional image form the Vandersteens wins. Best bet would be to get a pair of .7s from your dealer and demo them at home. Very important to hear them in your room. 

I still think you should add a sub. My room is about the same as yours and by adding the subs, everything sounds more real and integrated.

I've owned only Vandersteens, Revels and Magnepan.  Currently have Vandersteen 3.7s in large room.   Have heard .7s at the shows......
I believe you'll be very happy with the Magnepans, but you'll need a lot of current for them to sound their best.......

The .7's, like any dipole (including the ET LFT-8b), need to be a minimum of 5' from the wall behind them (because of the precedence effect), in your case the 13' one, the speakers firing down the 16' length of the room. Because of the figure-of-8 radiation pattern of dipoles (with a null to either side), the speakers can be very close to the side walls, with tweeters on the sides (inner) away from the walls. With a listening distance of 8', that leaves 3' between the lp and rear wall. Use dispersion behind the speakers, and absorption behind the lp.