I do like FoN when I play Cho'Gath just because I really appreciate the combination of big MR + movespeed on a single item. There's other options that are probably more efficient on Dominion, but when I also want to fit in 40% CDR, armor, and a decent attack speed item, there's only so many item slots to go around.
I also really like Shurelya's on tanks/initiators despite the less than ideal regen stats since that mini-ghost active has been so loyal to me. It's saved my life so many times and secured enough kills that I feel it's well worth the premium on HP5/MP5. Nothing like boosting an AP Singed with ultimate on straight into a Graves, where he then flings him for half his HP into me for a free kill every single time.
I don't really think there are any straight do not buy items on Dominion, unless those items are shakey prospects to begin with on whatever champion you're playing, such as Tear on champs with long CDs or don't really need the huge mana pool. All depends on the situation, but the big difference is that farm is much less of an issue than it would be on SR, so oddball or unusual item builds come to the fore.