Have you considered a pair of NuForce 9SE V2? They are in your price range and could easily drive your speakers. Power cord upgrade is a must and still would be around 6K.
Have you auditioned a Spectron vs. a NuForce? Of the amps I tried vs NuForce I believe you would be hard pressed to find an amp better for under 10k. Just my humble opinion and ears!
I like tube equipment. In fact I have a BAT VK 31SE driving the NuForce amps. You will not find a tube amp that can control the base and give you the power of the 9 SE V2 for anywhere near 5K. The inner detail and soundstage are excellent without any fatigue whatsoever.
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