Love this one.
http://www.youtube.com/watch?v=lza2H-fj5Es
This track really takes me back, and if the lead isn't an iconic riff I don't know what is. I just wish I could find out what Geoff Downs used. I'm sure its accurately identified out there on the interwebs somewhere, but I have not been able to find it.
To me it sounds like a DX7, which I think would be about right for the day, although a brass lead like that could have come out of many synths from that era without revealing what it's made on.
Here's a live performance of the song but I can't make out what board he is using, definitely doesn't look like a DX7.
http://www.youtube.com/watch?v=9mqfSkeSarw