Finally, my turn to post to this thread with a picture to contribute! :rollface:
I found this guy at a LFS on Saturday.
I'm not 100% certain but I think it's
S. gigantea. The tentacles are uniformly long and narrow, they vibrate or wiggle constantly, the oral disk tends to fold up abit instead of lay flat, and the verrucae are purple. I tried to get a photo of the verrucae but my camera has no macro capabilities and I think I got in too close so the detail is kind of lost in the lack of focus. (Sorry, I tried .. need a new camera!!)
It's only about 6" right now.
The pictures also don't show it, but there is a subtle yellow colour in the tips of the tentacles, that I hope will darken up in time.
It appears to be fairly healthy and robust. It attached instantly, it is holding on in a spot of quite high current, and it's even capturing mysis and some cyclops-eeze (of all things) when I feed the tank.
A larger picture can be seen here:
http://members.shaw.ca/hobiesailor/temp/anemones/carpet-day3.jpg