The Zebrasoma species are hard to beat for hardiness when it comes to tangs. The scopas is probably the smallest of the ones that you can ACTUALLY GET (the gem and black get about the same size if I'm remembering correctly).
The two sailfin species just happen to be the largest of the Zebrasoma species. Both of them top off at around 40 cm's.
As far as being the MOST hardy and ich resistant though, I'd say, flat out, the Sohal and Mimic tangs trump every other tang out there. I've seen a LOT of tangs, and trust me, these things are going to be the last ones in a tank full of tangs to get ich. However, we're all aware of the potential sizes for both these tangs.
What it all REALLY boils down to, though, is find finding a really healthy individual to start with when you do buy a tang. I added about ten different types of tangs to the store display tank about two months ago and haven't really noticed a difference in hardiness since. None of them contracted ich, none of them skipped eating and none of them randomly wore out.
Just some food for thought.
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