Don,
You were one of the very few who got along with the BK-7M...even die-hard Roland fans like Fran, Diki, etc. are/were very disappointed in the instrument.
Here in Cape Breton, they sold only two, and both were returned.
I do hope you have better luck with the PA3X...they sold only one here(against many, many Tyros4's)...biggest complaint was lack of support and very few third party (and factory) styles available.
I do think the PA3X is a very professional arranger, and I think the ergonomics are superb and probably the best of the current crop, so maybe those pluses will make up for the minuses.
In any case, good luck with whatever you choose.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.