Significant Upgrade (my opinion)
I owned the Veracity STs for two years and prior to buying them I heard the Motion 40s many times at BB.
The Salks have the highly praised RAAL ribbon along with the Seas midwoofers in a transmission line set up. The Motions have an AMT along with their midrange and ported mid woofers.
The Salks go much lower and with more authority...and the top end is much smoother...I always found the Motions to be a little on the bright side.
Both project a good soundstage...although the Salks soundstage is deeper and wider.
Both have a fairly narrow, call it a foot wide, sweet spot, but the Motion is more fussy about the height of the listening position.
There are two other speakers that have great reputations and also use the RAAL ribbon....the Ascend Acoustics Sierra towers and the Dennis Murphy BMR towers....all would be a step up from the motions...but even buying preowned, you will be looking in the $3k+ range.
And oh, that Salk finish...definitely speakers that get noticed and praised when it comes to looks.