vandersteen 2sigs to magnepan .7 good move?

Room size ? System? I love maggies and have had many . The ticket is maggies with vandy subs. There are a set of 3.6 on the gon for like 2300 i think👆 there killer . But you havnt explained your setup so ...

Eminent Technology LFT-8b. There are a used pair in Washington state right now on U.S. Audiomart for $1800. Magnetic-Planar push-pull design inherently superior to Magnepan’s single-ended models. 180Hz to 10kHz from a single driver! Woofer below 180Hz, ribbon tweeter above 10kHz.

Vandys and Maggies seem to share a lot of similar sound qualities.
I remember hearing Maggies years ago and I still remember them positively.
I ended up with the Vandy 3a sigs and 2w subs.
In my opinion, you are going to need subs. 
Can you get a pair of Vandy 2w/2wq's? Or, if that is too much, a pair of Hsu subs. This will get you closer to bass reproduction, that the 2 sigs lack.
If you still have the 'itch', then you could get a pair of Maggies. The Vandersteen subs are a great match for them.
If you can afford it, you should listen to both and see which ones you prefer. But, I think you should first get a sub( or,preferably, a pair), as this will be the most cost efficient upgrade you can perform. Trust me, I've been there....