Best upgrade path?

What do you want more/less of?

I'd start with speakers first.
My suggest: Dump the Totems for whatever you can get for em (I seea used pr goes for like $1500. Take that money, throw in a another $1K and get the Tyler's MTM design, Either floor stander or the lower priced book shelf model.
Now work around that. Next step is pick up a used tube cdp, for under $1K.
For amp, I'll leave that to someone else. The Tyler MTM's need the juice though.

Perhaps a little more bottom end, and a little more"oomph"
to the presentation. It's hard to single out what I'm looking for specifically because I haven't listened to
many other systems.

If your current system has what you've been looking for, then why upgrade? You wouldn't wanna get upgraders regret; parting out a system you enjoyed, then once its gone, kick yourself for parting it out.

I hear a little talcom powder can help the itching though. :)

Seriously, take my advice for what its worth. Keep the system if it truly makes you happy. No need to upgrade until an upgrade is needed.

wait for the itch to pass, or get into vinyl...where you'll have a world of issues other than upgrading your great components.