I'm also only an enthusiast so we're on the same grounds here.
IIRC, the inner moons have stains on the trailing hemisphere while Iapetus is the reverse. Edstrick suggested a theory that it had to do with magnetosphere interactions with the surfaces. I'm not inclined to put Iapetus in the same basket as Dione/Tethys/Rhea as these have only a slight albedo variation, while Iapetus' dichotomy is orders of magnitude. Cassini Regio is also pretty well-defined, the other moons' splats are subtle and faint.
Edit: There's also a small Enceladus sequence that appears to be looking directly down on the tiger stripes. The distance is rather large, 660 000 km. http://saturn1.jpl.nasa.gov/multimedia/ima...eiImageID=96406
Edit #2: I've found a Rhea mosaic I made from PDS using stretched color, toned down to more natural colors that approximately shows the same view as your image. It can be found here
. Of all the moons in the Saturnian system, I'm having the most trouble figuring out Rhea's exact color. VIMS was of little help because it was very noisy and useless. In rgb composites I get a creamy brownish color (with a touch of bluish streaks and that big crater splat) that is somewhat different than the single CICLOPS release. It's not too far off, though. As can be seen comparing Ian's composite with this mosaic, natural color differences are very subtle and the whole moon looks fairly dull.