I've been swamped and the mini has collected a week and a halfs worth of dust on it. I'll post more when I can get back to it, but for now it sits at XP loaded on it and GPPVR running. No Capture card plugged in and no TV output tested.
I'll be honest with you though and say beyond bragging rights there is little to no point in this project unless you already own one of these or are just a diehard Machead. You can scale the project however you like, but I got the duo core with apple care (3 year warranty) and the adapter and I'm already at 1K. Now upgrade the memory at a min. of 150 and add an external drive and this project is rapidly approaching $1500 without a tuner. You can buy a LOT of PC for that and go with very nice parts to boot. (not to mention I have to run XP on this thing ANYHOW to get GBPVR going so what real advantage do I have?)
At least I get to learn Mac stuff now, but beyond that I'd say save your money for now. I reserve the right to change my mind when apple releases the next cool gadget.