Hi Bachus
The PA800 is a MOTL arranger (At least price wise) and that is why did not include it.
The Abacus is basically a single manual Verona organ (Hence it has all different types of organ keyboard combination set-ups) rather than just a keyboard, whereas the (Now discontinued) Ikarus and New Pegasus Wing are just keyboards, and this is the reason I have omitted the Abacus.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).