like the other members have written - it depends on what YOU value. True the prices you quoted for the 2 used items are nearly $2K each but........they are w-a-y down from what a new product costs. You are getting some of the better electronics for, I would say, a very reasonable price.
Also, IMHO, iffffffffff you are going to spend nearly $2K on the power amp, instead of getting the T400, I would much recommend you get an Aleph power amp. You might lose a bit on the quantity of bass but you'll gain in its quality. There a few Aleph power amps for sale & a Aleph 5 or Aleph 2 monos (these are nearly $3K!) might do the trick w/ your Spendor speakers.
In comparison to any T series amp, the Alephs are far more open. Their midrange is to be heard to be believed - tube-like from a s.s. amp. If one of the Alephs on sale can drive your Spendors, you'll not regret the switch. I feel that an Aleph is a longer term keeper vs. a T series amp. Also, as it has been noted on several threads here on A'gon, the T series amps are NOT designed by Nelson Pass. They were all designed after he left Threshold. The Alephs are 100% Nelson Pass designs.
FWIW. IMHO. YMMV.
