In a response to another thread, Jeff Wong wrote:

"I have several upgrades for my system in mind once funds allow, but, my present system makes me grin with delight often enough that I can afford to wait."

First of all, congrats to Jeff! Second, now seems like a good time to revisit the question:

What tweaks or upgrades to your system do you currently have in mind? What will your next hi-fi purchase be?