Re: Wizard of Oz Witch and man of tin by scaletta Intrest only.
I'd like to have all of them and more, but I agree with ishothimsixtimes. Since most interest is likely to come from those who already have Iminime Dorothy, I'd finish off the Wicked Witch-Dorothy pairing first since that only requires one figure instead of three to complete a "set" of characters that go together without the sense that something's missing. The other "set" being Tin Man, Lion and Scarecrow to go with Dorothy.
Granted, it may not be a bad idea to start with a harder one like Tin Man or the Lion because then whatever characters are left will be easier to make down the road if things fall through. However, I wouldn't want to be stuck with a partial collection of characters, so the Wicked Witch seems like the best choice (and I really would like to have her the most).