Until I looked it up recently, I didn't realize how close Spa was to the 'Ring (geographically). I know there are several outfits that hold trackdays at both. I think next summer or 2014 I may try to work out a schedule that has me doing a track day at the 'ring one weekend and then a day at Spa the next weekend.
Somewhere in there a trip down-under would be nice as well, but the flight from the 'States...
as a side note, Suzuka, Tsukuba (just because), and Fuji would be a helluva way to see Japan, but also an expensive one I have a feeling.