$5k or less speakers (used or new)?

Another vote for Tekton Moabs. 

minor embellishment of avanti1960's  rec on harbeth

three main speakers are

mon 30 - more midrange focused, light on bass

compact 7 - similar size to mon 30, more full range warmer fuller deeper bass than mon 30

super hl5 - descendant of spendor bc1 - larger box than prior 2, super tweeter, even fuller and more extension both ends than compact 7 both ends, similar signature, better for larger rooms

then there is mon 40 - which is a huge box for even larger rooms

all are utterly natural dimensional listenable speakers

/* Full Disclosure: I am employed by Ostinato Speakers */
Hello - we are a new start-up company that make hand-made, configurable speakers from a well known designer.  May I shamelessly suggest you look at these?  Ostinato Monitors are 3-way design with ribbon tweeters, open back mid-range and switchable cross-overs for near or far wall placement.  Selection of wood finish, connectors and optional cross-over upgrades.  $3950/pair. 

Cheers - JB

The all new B&W 700 Signature S2 Series coming out soon
 These speakers have Carbon Tweeters that are almost as good as the Diamond Tweeters in the 800 series   They use the same speaker drivers and crossover parts used in the 800 series too