The IBM Model M SSK is the sweet spot for me. Smaller than a full-size Model M, but it still has the buckling springs. In addition, the SSK has two-tone dye sub PBT keycaps and an embedded numerical keypad.
However, if you want to go with a contemporary board, I have found the CoolerMaster QuickFire Stealth TKL with Cherry mx green switches to be the best I have tried with Cherry switches. If you prefer Alps-type switches, the Matias Mini Quiet Pro and Mini Tactile Pro are worth a look. Finally, tonight I am trying out a Keycool 84 white body with laser-etched PBT keycaps and Cherry mx blue switches. Because of the low price and relative lack of attention on the forums as a serious board, I did not expect to like the KC84, but I am liking it. I intend to post a brief review in the near future.