oh well alright, Ya this gguy offered $300+ that whole setup with cinema display for my 13' late 2011 mbp .
tryin to find out more info if its a good deal or not.
your second listing for the macpro would be much better, can run current os, software, video cards etc.
I have a G5 and they were obsoleted as soon as Apple moved to Intel. 10.5 is the last OSX it can run, also limited to FCP 6. It doesn't even know what avchd is, need clipwrap to convert it to something recognizable.
Honestly, for the best bang-for-your-buck, that would be the way to go! But it can get mighty complicated if you've never built one before. I toyed with it for a bit before just switching back to Windows- was more stable.