I've downgraded my professional status to hobbyist because I no longer make a living from producing or engineering music. That's not a sad story. I quit engineering to pursue my dream of working with a charity to develop arts in the community. That being the case, I still do a good bit of recording (studio and live), mixing, and mastering, but I don't make any money for it, which also means I don't have much money to spend on gear.
The problem is my G5 is now 9 years old! Yes, it still runs DP, but as you well know, Universal Binary is going away and Leopard is almost antique, so many plugs are not even compatible. I've considered upgrading to a Mac Pro, but Apple's apparent lack of commitment to the Pro and the Pro's lack of Thunderbolt, plus the cost involved, has me gazing towards a 27" iMac with a quad 3GHz i7 or a Macbook Pro, which would be plenty power with a Firewire interface and TB HD.
The downer with this option is my PCI interfaces become obsolete. I'd have to give up my 2408mkIII and HD192, both of which have been powerful tools. AND I'd limit my I/O with a Firewire interface. I can currently track 36 inputs at once, useful for live recording, but not necessary. Sooo...
Is it really worth it to go with a Mac Pro? Are DP and most plugs that much better, smoother, and glitch-free? Do you really think the 8 or 12 cores are that much better than an i7 for DP? How is Lion doing with DP and most plugs (I know seems like a different subject, but I feel it's an important part of this equation)? Are the internal drive bays adequate without the inclusion or TB or would TB be a huge addition? Are the PCI interfaces still superior to MOTU's Firewire interfaces in audio quality or have the Firewire interfaces caught up to the HD192? (I'd like to stay with MOTU because I know and trust their reliability and compatibility with DP.) Since MOTU has shown no apparent interest in continuing to support PCI, is it better to jump ship now and get on the FW bandwagon? What's been your best configuration (CPU, OS, etc...) with DP7.24? Lots of questions.

So, if you were in my shoes, what would your thoughts be?