The next set or should i say sets are all in the same quest. which is this: http://fallout.wikia.com/wiki/For_Auld_Lang_Syne This quest is complicated and very contradictory. But before entering the remnants bunker, heres some preparation, leave your stuff (bring one good weapon atleast like the ycs/186 ) at a house eg. novac, lucky 38. Have speech 80+ (i think, you could get 100 to be sure.) Using the wiki link, activate For Auld Lang Syne.
In the bunker:
You will be directed to go into command room, make sure you are prepared. Now in the command room instruct you want to help NCR, and orion moreno will be a drama queen and leave. Talk to him outside the command room and pass the speech 80 check about the enclave going in guns blazing. then arcade will come up to you and tell you he has to go do something. Now go into the command room and get a set of remnants power armor from daisy. As soon as you get your armor kill moreno for the armor he is wearing, be cautious everyone but henry attacks you. I usually knock morenos gattling laser out of his hands and use it (when i do this unarmed.) But if you have a good weapon then you should be fine. After killing moreno the quest will fail. in the vertibird's cell wait for roughly 4 days and then proceed to leaving to the forest area. Outside arcade will talk top you and you can convince him to give you the gannon family testla armor.
However the remnants will not appear at hoover dam. (i think anyone tested this?)
If there are any questions ill be happy to answer pm's.
Thanks for listening folks, Angus.