(I was hoping you were just bragging, now I get to ask you questions about your setup 😀 )
On our setup, I have been ripping only DVDs. I need a much more powerful machine to do our BD encoding. I'm watching an episode of Band of Brothers encode on my ubuntu box (one of my encoding slaves) and it looks like its going at 2fps (average). Now I'm using the ATV3 preset for everything, and using stock Apple FW on my ATV3's since, well, there isn't a JB for it yet. I was encoding at High Profile until the ATV3 preset came out, and I can't really see/hear a difference between them.
I will be getting a mini whenever the hell they refresh, and I'm planning on upgrading it (biggest HDDs I can find and server OS) to run our house o' Apple gear and do our BD encodes.
Now my question to you is what are you using to do your encoding, and about what are your file sizes? I'm only throwing around 500MB (TV) and 2GB (Movie) at a time, and I enjoy watching the activity monitor and our 'server' doesn't even break a sweat.