If we won't get them native in Reason...
Digital FM synth, 6 or 8 operators.
Additive Synth along the lines of a K5000S (beast to program...)
Transwave synth ala Fizmo.
Scanned Synth Pro (humanoid sound)
More Audio Damage stuff.
Some awesome hybrid nobody's thought of, yet.
I like digital synthesis types
Enough with the virtual analog/emulations already
Also, Numerology's CV sequencers would be amazing.