Most significant upgrade

i think source is the best upgrade.

Not so much a upgrade in my case, but a real thrill, the Daber Monitor 3 speakers, really nice. The Xantech BT6 bluetooth wireless dock. My ipod touch now has become my wireless music server. It sounds amazingly good and does not cost a semester of college tuition. It is way cool.

Not for nothin', but as I see it your first two -- and most important -- components are Margot Timmons and the general ambient music in New Orleans. Ask me: relax and enjoy, you're doing it just right.

Room treatments!

I think Mezmo is right, your system looks pretty good as is . To get a real "upgrade" you are going to have to spend a bit of coin. The one thing that may not cost you much but give some good results would be to sell the speakers and get a pair of Vandersteen 2CE signatures in that system.