lukitoh,
I just sold my PA 80 a couple of weeks ago and I want to focus in on a couple of things you said and what the others have said too.

The fills on the PA's are not very good and they do not blend near as well as Yamaha do, many over on another PA forum have complained about this and there are only 2. I've owned both boards. As far as a vocal harmonizer, the Tyros that is coming out is the first I've heard of that can actually follow the pacing of your voice (I could be wrong and there may be some other one that will do this but not that I know of).

You can in fact overwrite the factory styles on one and that is a very cool feature, but you cannot overwrite the voices and there are only two banks that you can load new voices into.

The drum kits are debatable, personally I liked them but many complained, mostly those doing dance type music that they didn't have enough guts behind them.

I would disagree, in my opinion that the styles are better on the PA than on Yamahas. Availability of new factory styles for the PA was non existent until just in the last week. I would expect if history is any judge any new ones beyond these will be a long long time in coming. Yamahs have tons and tons of available styles on the net, as do Rolands.

The PA's are quite a bit more difficult to navigate than are Yamahas, when editing and the like. Some of the global parameters are not savable either, for instance if you want the speakers off, because you play through an amp, it will not save this, they default to on, or if you want to do a midi setup that you use all the time, with certain channels set for certain things, it will not allow you to save those either. It's not a bad board, but does have to me some idiosyncracies that I found annoying.

Lastly, at $1500.00, you can find a very good board, but a great board I think may be pushing it. I think the great board with some of the higher end features you mentioned are more like in the $2500.-$3000.00 range.
Terry