Is there any one piece of vintage gear you most wished you owned?

A pair of Western Electric 59A amps with meshplate 252 output tubes.  The tubes alone would be worth north of $60k, so the amps would probably be north of $150k.    I’ve heard a single amp, not a stereo pair, and it is easily the second best amp I’ve heard.  The best, a one-of OTL would be a good choice too, but it is a bit scary operationally, so I would be more comfortable with the 59A, not that this would ever be a reality.

A mint 301 would be a nice real world choice of vintage gear.  I actually like the looks of the 401 a little bit more, and it has a better motor.  A friend has a 401 with a transplanted grease bearing from an older model 301.  That is a really nice combination.  

If you want a really souped-up version, check out the Artisan Fidelity reworkings of the 401.  Couple this table with a good modern tonearm and it would be a world beater.

the Klipshorn to own from the past would be one of the first twelve ever built.  They had Western Electric 713A compression drivers in them.  These days, you can spend north of $20,000 per pair just for these drivers, and that price would be worth it given what those drivers deliver soundwise.