Try the BAT VK-50SE. I recently heard it with a VT100 MKII and Audio Physic Virgos and it was a wonderful combination.
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I would probably choose an ARC LS-15 first. The two are the same vintage and were designed to work together. The VT-100 mk1 is leaner, more lightweight than the mk2 version and the LS-15 compensates for that by being softer and richer. At a lower price or different brand maybe an ARC LS-7, C-J PV-10, or BAT VK-3i (though with the VK-3i you'd be better off with a VK-60 for power).