It probably won't be until next year that I can afford a motherboard (by then AmigaDOS4 will probably be out). Considering the questionable nature of the whole thing, I plan to keep expenditures to a minimum. So I would get the XE/G3. My PC is a real powerhouse and I plan to use it for the heavy-duty stuff for the foreseeable future.
I haven't upgraded for years. I have an Amiga 2000 with AmigaDOS 2.1, and haven't put any money into it since. This seems like a good time to upgrade to the latest hardware and operating system, even thought it's just a big hardware toy.