The only awkward things I can see are the Nurses, Doxies, Asura and the Punk Zombies. All of them come in boxes with other models in 3E. You'll have to buy a 2E Rafkin, or wind up with two sets of Nurses. 2E Dead Doxies or double buy Bete and the Dandies. Asura's *always* going to have 5 Mindless Zombies in her box. The Punk Zombies currently come with Molly, but her 2E box has Crooligans, which come with Archie in 3E, so either way that's going to be a double buy.
You actually have two of Reva's other boxes' contents too. Everything in her keyword except Wanyudo (who's in TT and a pain to collect but an amazingly little flighty model) and Mourners (who are also in Seamus' keyword, but pretty bad). She's not the strongest master atm, but you're well on your way to a complete keyword.
You also have all but one box of Yan Lo's stuff, and all but one of Von Schtook's stuff. Von Schtook was crazy op and recently got a nerf, but I think he's still solid. I don't know a thing about Yan Lo though.
And Seamus is pretty close to complete other than Mourners (which are bad) and Doxies, which are going to be awkward to buy, but are good models.
You've also got a pretty good selection of versatile models. Asura's going to be awkward, but she's not 100% necessary, though I like her. You're actually really well placed for buying any other Master boxes you want to try out and just running with what you've got.
I loved painting the Drowned. Actually, all of Jack's crew. Lots of chances to play with odd lighting and put random things on flight stands.