How about the voice quality of the PSR1000 compared to PSR740 ? Is it better ? Lets say both keyboards are plugged in to the same sound system. Which one will sound more professional ?

I'm talking about the basic sounds that I normally use like piano, brass, string, bass and sax. Or are they pretty much the same ?

I don't use the sequencer or song recording at all. Maybe once or twice. It's not that important to me. Vocalizer is also not important. The sound is what's important.