Wharfedale Linton Heritage vs...

find a set of used proacs or harbeths or spendors

A lot of positive reviews on the Lintons, maybe you should try them out at home?We have all had demos on equipment that didn’t live up to our expectations, it doesn’t mean these won’t work in your system.
lots of factors determine a speaker choice - music preference, other equipment, room acoustics etc. The speakers you have listed all seem to garnered positive reviews so go have a listen and see if it’s your cup of tea.
Good Luck and have fun along the way.

Crutchfield will let you try them home for 60 days with full return privileges.

Same thing for Music Direct - full 60 days.

Should plenty of time to listen and let your own ears decide.

Enjoy

As much as I hate the prospect boxing things up and returning them I may give them an audition. Q Acoustics has a 30 day return, if I'm willing to float around $3k for awhile I can A/B the Lintons and the Concept 40 head to head. I would only hope the choice would be clear, to like them both equally would be awful.