Reccomend an integrated tube Amp-under 2k

I think, given your speakers' specs and your desire for more dynamic power and greater clarity, that a Pathos Classic One Mk III would be something to explore. You'd get about double the Melody's output at 8 and 4 ohms (130 at 4, within your peak range for the speakers). The pre stage is Class A and true balanced, and has a pair of XLR inputs, which makes it more versatile than the Melody. It also has a remote, something the melody lacks. I think the Solid State amp stage might also give you the dynamic authority and strength in sound staging you cite as a problem with the Melody. I heard the melody in a casual listening sessions and thought it pretty nice, but that it would be bested by most others mentioned here (VTL and Rogue especially). I think that Pathos keeps its resale well, as it's got good reviews, looks great, and most importantly sounds great.

The Pathos one seems VERY nice, but there is noone in US that sells for under 2k:(

The Melody SP3 is rated ~38wpc, but not all watts are the same in tube-vill. Melody isn't a company particularly known for producing muscular amps, so their emphasis might be elsewhere.

Manley Labs, on the other hand, is famous for their powerful tube amps, even their lower rated offerings. Their similarly rated (in Ultralinear mode) Manley Stingray will probably provide much greater authority and drive than the Melody. There is one listed here for under $1,500.

The thing that you have working in your favor is that the QSO 626R are -3dB @42Hz which will save any tube amp from having to reach too deep.

A Cary SLi-80 might also do the trick at 40wpc Triode and 80wpc Ultralinear. Cary does midrange richness and tonally density like nobody's business. There are two here for $2.1k OBO - one with the F1 upgrade, the other the Signature Series w/ Jensen Cap upgrade

Almarro A50125A(125wpc) tube integrated - a little out of your price range($2.2k, new w/ warranty), but I owned one of their other integrateds and it was superb for the money. Here is a 6Moons review where the A50125A and the Manley Stingray are directly compared.

Thank you Darkmoebius and everyone else!

The Pathos Classic III is on audiogon now for 1500 for a Mk III and around 1000 for a Mk II. Just search for pathos. I wouldn't necessarily go for a Mk I since II had some good improvements that III inherits.