I've never owned either, I have heard them.
Canton will give you a slightly larger soundstage, but will be brighter and not quite have the ooomph in the low end that those Legacy will have. Legacy makes a nice speaker, the dealer I heard them at said they are a bit harder to set up (and futzed around with them for a while) to get a bigger soundstage. I thought they were nice sounding, lots of bass (a little one noteish but not bad), and certainly not too bright.
Lots of speakers in that pricerange new/used.
GoldenEar Triton's
Monitor Audio - I heard their Platinum PL 300's, good bass similar to canton. Might be worth an audition.
Those new Polks (haven't heard), first review seems like set-up is finnicky.
DynAudio Contour Series
Smaller guys - Tekton, Salk, Ohm, Selah, VonSchweikerts
Some older Wilsons can be found used, Focal...
Definitive Techology
Just a lot in that space.
If a larger soundstage with bass is what you crave, something bi-polar, open backed, omni-polar or similar might fit the bill. Tekton and Ohm seem to have a lot of bass and a big sound for the $$$.
Salk and Selah will do custom or semi-custom stuff.