Just out of curiosity, Jose, have you tried the G70 in Pianostyle mode? For what you say you need, a 76, a great piano sound, and good tracking in Pianostyle Mode, it might be just the ticket.

I put this together very quickly (it's got plenty of those mistakes your audience needs to hear to be sure it's real ): http://www.roland-arranger.com/smf/index.php?topic=444.msg2597#msg2597

At around $2000 for a used one (at least in the States), getting one of these could leave you $3000 to buy something else as well, compared to an Audya!