Upgrade my Theta or move on?

Interesting, your system has some similarities to mine. I had a Rotel RCD971 CD player, Theta DaVid II DVD transport, Theta Casablanca II with "superior" front channel DACs, Sunfire AMP and Mirage speakers. I'm currently upgrading to Vandersteen speakers (3A Sigs, Vcc-1, VSM-1) from the Mirage's. This should add a huge improvement in imaging, detail and clarity. I'm planning to improve my music listening further by adding a good two channel pre-amp and better dedicated CD player. Movie soundtracks are satisfactory already. Based upon what I've learned from the "Audio Perfectionist" going this way will offer significantly better quality for the money than upgrading the Casablanca processor. I'm sure I will come back around to that but not until after upgrading to a dreadnaught amp and maybe better speaker cables.

I'm picking up the Vandersteen's this weekend. I've wanted them for quite a while and finally have the opportunity to buy them "used." I'm really looking forward to it. Of course now I'm already planning my next upgrades. I'm sure you know how that is. If I only had more money!
The 5A's are awesome, but way out of my price range at the moment.