Wilson Sasha 2 Pre owned?


I am now listening to 25 year old Proac Response 3.5 speakers with Audio Research tube electronics.  Great speakers but I'm considering an upgrade.  I really like the Wilson Sabrina but now have a chance to buy pre owned Wilson Sasha 2s in the low 20's. They are about two years old but cosmetically perfect, would include a 3 year warranty from Wilson. Also, there was some kind of resistor upgrade after these speakers were manufactured and the dealer would include the upgrade.  The boxes/crates are not included.  Looking for any advice on whether this seems like a good deal, whether the Sasha 2s would be a big step up from the Proacs and whether the used Sasha2s are a better choice than new Sabrinas (which would cost less).  Have to decide very soon because there are others interested in the Sasha's. Thanks. 
brownsf
Seems to be two totally different speakers, albeit same manufacturer, with different power requirement needs.
My friend has the Sasha two’s with audio research electronics. They are incredible. I have Sophia two’s, also with audio research  electronics, And to my ears, they are also incredible!  The Sasha’s have more bass, and more of that holographic soundstage that we all love.

 If I had to choose between the Sabrina’s at the price new, and the Sasha two, at a second hand price,  and those prices were similar, To me that isn’t even a choice at all! Sasha two all the way.
I would also go for the Sasha 2, heard them with Audio Research, and to me they are incredible speakers.
I would only add that if the dealer is a Wilson dealer, I would make sure they got the crates and packing from Wilson to seal the deal. They are very heavy speakers and later on if You want to sell them, You will be able to ship them in the crates versus having to only sell locally because you don't have the proper crates to ship them in.