Recommendations for Vintage Speakers

Klipsch Fortes (or IIs)
KEF 104/2s

Paired with an SX-1250? HPM 100's :)

Snell Model A, but early 80s Kefs (104/2, 105, 107) would be up there.  

<<The Dahlquist DQ-10 would be on my list!>>
I second that.  I spent many, many years mesmerized by my DQ-10s' imaging capabilities and tonal accuracy.  They were never regarded as speakers with an authoritative bottom end, but the bass was absolutely satisfying and realistically presented (10" woofers if I remember correctly) - IMO far preferable to high-end monitors that, by design, sacrifice the lower octave in favor of mid-range realism.

One of my favorite speakers is the KEF 104/2. They were made between 1984 and 1996. They are very non-fatiguing, exhibiting a rich full midrange and smooth highs with enough bass to satisfy most people. They produce a large 3 dimensional soundstage with superb imaging. They do need some power to get the most out of them.