We have a yellow tang and a powder blue in our 210g. Both are typically pretty aggressive (big and bossy types) tangs, so this can be done in a tank that is big enough. The powder blue is generally the more dominant of the two, so it's good that you have the yellow in there first and add the powder blue later. Be absolutely sure that you don't want any other tangs before putting in the powder blue, as there are very few tangs out there than can hold their own being introduced after a powder blue.

As far as the rest of your list, it all looks good given the size of your tank. We pretty much have (or have had) all of the above in our 210g with several others.

Also... sounds like you are starting these guys in a new tank (maybe transferring the yellow over). If you end up going with anthias, please read the article about them in the newsletter this month and put them in early in the stocking process - after the tank is good and stable but before they have tankmates who will give harassment, give them plenty of places to hide, and they'll be out and comfortable and a real joy for you.

Good luck and keep us posted (preferably with photos!)