I don't think I'll buy any of them. Many of the changes (like the unnecessary powering-up of dwarves and barbarians) just seem sort of ill-advised, and I think the "feel" of D&D has probably gone downhill after 3e's publication -- beginning with Sword and Fist, I think the system has devolved into a bloated mess of ill-thought-out rules expansions, (like the Epic Level Handbook and Savage Species), prestige classes and escalating power levels -- if anything, I suspect that 3.5 will just be a further step in this direction.
This isn't to say that d20, as a whole, isn't wonderful, and I am really excited about Arcana Unearthed.
