^ I agree, S/S '09 Sanguine is more brown based than Rouille. Rouille is a nice rust red or orangish-red color that's not too bright and not too light.
The closest color to S/S '06 Rouille is F/W '07 Paprika...they are nearly identical, IMO.
I have a couple pictures that shows just how different these reds are compared to one another along with a more true red as well.
F/W '07 Tomato City vs. S/S '06 Rouille First vs. S/S '09 Sanguine Work:
If you like the orange tones in the Rouille color, you might like S/S '09 Mandarin...it's definitely more orange, but has lots of red undertones:
However, due to color variation from dye batches, some Mandarin items are decidedly more orange and don't show the deeper red tones like that Courier in the previous pic, here's another comparison pic:
And BTW, Sanguine is not anything close to Rouille IMO. I would rather say that Mandarin is pretty close, like RealDeal mentions (great comparison shots!!). I have a Rouille City and a Mandarin MU, and IMHO I think Rouille is much prettier!