Thanks too all!! For your response.
It is one thing to demo in a store and another to own both!! That is why I asked, and as usual, received the info I wanted from all of you.
I am selling my SD1 (On Ebay Now) and deciding between the PA1X and the Tyros. If I go with Yamaha it would definitly be the Tyros. I only asked the question because the 2100 was so impressive. It appears to me they improved the Key feel a bit?? Over the 2000?? Although still not what I would prefer.
Coming off the SD1 the key feel of the Tyros is still not what I would like but it appears this is were most KB's are these days. Thus, my interest in the PA1x!! I just heard today that Korg USA has received and shipped units in the US. I may get my hands on one shortly, if I do I will post my impressions. Once again, Thank You!!