Hello :

I had the PA60 (for several years), that was the prior Italian version of the PA50 that like you said, is built in China, virtually the same with the exception that the 50 needs power adaptor and took the HD option out, also, the Keybed is different, not as solid like in the 60, the tone generation is the SAME as the 60/80 with the exception of ONE DSP.
The dynamic allocation is the best, rarely I got midi choke or missing notes, in contrast, the was the reason I gave up my Ketron SD1, the tone generation use a LOT of voices and takes little effort to get missing notes or latency while playing.
Getting back to Korg, I sold my PA60 that still gigs to a colleague that also gigs out, the PA50 I understand was corrected from the not so good introduction, then I got the PA800 and 500.
Only if you get to play the later models, you would not want to go to the 50, the reason is the tone generation is a lot more cleaner and has more RX sounds=S.A.& Mega/Sweet sounds.
I never had screen problems with the PA60 and the 50s I sold at the store (while back), ONLY the first shipments had trouble in several areas, like in the keybeds, some with screen but not the majority, we returned those units to Korg and we gave our customers a new unit that was exempt of problems other wise.

Keep in mind that the tone generation that the PA80/60/50 is from a little over 8 years old, so you know.
Good luck in your quest, let me know if you need more info.

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mdorantes