Bookshelf Recommendations

What speakers are you replacing? 

I also use a tube pre with a SS amp. A solid approach for many reasons. Not to say the only one.

A couple stand mount speakers I have heard you might consider:        Dynaudio X14, X18
   B&W CM5
Either could be bought used for~$700. 

The Vandy 1Cs may also serve you well. 

Seems it would be best for you to stick to a stand mount speaker.
Stands need not need to cost that much. Audioadvisor sells a steel 3-column pair for $110. Available are 20 and 24 inch heights. Columns can be filled (one has holes for speaker wire if desired). Speakers can be bluetacked to stands to be more solid.

With your room size some room treatment would benefit. ATS Acoustics sells absorptive material for DIY panels or prebuilt ones. They also can superimpose a picture onto fabric for covering panels which might be more tolerable to wife.

You have been given quite a list of speakers. So subjective a choice I find it hard to recommend. Given your room size I believe you certainly can find a pair that will be more extended and refined than the Wharfedales. I would search out reviews used speakers that sold new for $1500-$2500. Should not need to pay more than 50% retail. Watch those offered on AG and Ebay then research for reviews and specs. Vet seller prior to making offer.

Good luck in your search.  

The Pangea 3 column speaker stands sell for $100 on Audio Advisor. There is a '300' in the model number. 

Paulcreed, If I were looking for another pair of speakers I would be interested in those Usher Be 718s.   

Well, given that your have a system and are not without music, you can afford to take your time.