While I agree that there isn't a big difference between optical or coax, coax cables are cheaper and, IMO, are a superior connection.
Since you already have a PS3, I'd go with the 980H. The PS3 is a decent CD player too, but I don't really use it for music at all...that is what my 2900 is for
The 980 does very well with SACD and DVD-A though.