If you get the Vento, don't get the Vento Reference 9 DC!
From my research when I bought the Vento 820.2, the 9 DC uses the older Aluminium-Manganese tweeter design while the 820.2 uses a ceramic tweeter like their current TOTL Karat series uses:
https://www.canton.us/hifi/karat/
For its price, the 9 DC probably has better midrange and or bass, but the ceramic tweeter in the 820.2 is wonderful and the mids and bass sound fine to me (but I'm not A-B'ing directly against 9 DC either!)
One thing I noticed about the Canton speakers is they are somewhat more compact than I am used to. For example, the Canton GLE 496.2 with Dual 8" woofers and 7" mid is actually a smaller box (in all three dimensions!) than the Boston Acoustics A360 with dual 6.5" woofers and 3"(?) mid!