I put all three in, I don't have any headphones at the moment but I should be getting some AKG 702s pretty soon.
At the moment my speaker set up is this
http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?ctn=HTR5000/01&scy=nl&slg=en
Pretty good for what it is, i'll be upgrading to some better speakers and a much better receiver next year though.
The sound quality from the STX has made these speakers so much better though, and these new OPAMPS make them sound even more better.
You might as well try these OPAMPS out, they are pretty cheap and easy to install. Even if you don't prefer them to the stock ones you haven't wasted much money.
That seems like a pretty decent speaker system , having a fm tuner is a plus.
I don't know much about that brand , and I really don't have the room for a multi speaker setup . My 2.1 setup is plenty for me at the moment.
I will look into finding those OPAMPS though , thanks for the info and input.