If you like Linear switches, try picking up a Zenith with Green ALPS on Ebay.
They're very smooth, a little heavier than MX Reds (but lighter than MX Blacks) and ALPS have a really nice deep, thick, sound compared to Cherries which sound like thin plastic in comparison. Most of the boards also have exceptional build quality and NKRO.
Not MX compatible, but chances are the keycaps will be double-shot ABS or dye-sub PBT, so the stock keycaps are good anyway.