Well, so far XBMCbuntu is pretty great! Installation was dead simple... I ran into a couple of video card issues, which I had anticipated since every Linux install I've done with this card has had the same issue. I was able to manually install the proper driver and presto-changeo, perfect video.
I still need to do some tweaking to the audio... but it is working *well enough* for now that I'll put it off until I get a few more things taken care of.
I'm so strongly acclimated to CentOS that I find myself running those commands instead of Ubuntu... nothing that a bit of time won't fix (or perhaps some bash aliases to call apt-get from 'yum')
I have a Software Raid-1 array of my two new 2TB drives, and my original stand-alone 2TB drive mounted to the filesystem... my next tasks:
=> Set up the necessary network shares so that all of my home computers can access these for read/write
=> Set up XBMC to use these as video/audio/picture sources
=> Look in to BluRay playback from Disk, ideally from XBMC (I'm considering buying a BR drive for my HTPC, instead of a standalone BR player)
=> Possibly add DLNA streaming to have the option of skipping XBMC if I don't want to drop into that interface.
Now I just need to figure out what all XBMC can do. From what I've read of other posts around the internet, I feel like I'm using a Ferrari to run Sunday errands around town in 25 mph zones.