Looked it up again, seems like you are right (i thought so far that they wanted to "reset" the vault system with the change to the double unvaults and would progress with the longest vaulted ones. Good news with that Ember unvault if they keep to this system, ill get the chance to farm a bunch of her relics and theyll keep her vaulted a long time after that. IF they stay with that system. Which seems doubtful, after all, its awkward how the frames will be aviable in two almost consecutive unvaults (so, about two times in one year) but then vanish for YEARS without making DE any money), but it doesnt change much about OPs situation. So Nova will see a better increase in pricing, which is good for me as i sit on 14 sets, but unless op is sure he wont have a need to buy anything vital like slots, or can easily acquire plat in short term, buying a second set would be a waste. MORE so if Ember gets unvaulted in December, even in the middle of her unvault she will probably fetch more then five trinities in december.