I had a bit of a read/comparison of Nova/JET/RCS last night... Nova was appealing with it's flexi-schedule, since at first I'd want a bit of extra time to explore, etc, but yeah it feels a little too prepackaged. I dunno.
I'm not 100% sure about the RCS guys either. I'm going to be speaking to my jap lecturer and getting advice from him. He's been at my uni for 8-9 years, and organized ALT's for most of that time, so hopefully he'd have his finger on the pulse of what's kosher, etc.
JET sounds good, but god knows where I'd end up, and it seems like they're not too interested in taking preferences into account. At the moment, I'm hoping to live in the Gunma area... used cars, somewhat rural, good driving roads = Happy Sciby.
Interesting side note: http://www.jetprogramme.org/e/outline/data/Page1.html Only @400 aussies with Jet. I thought it would have been far, far more.