I believe we will only see EVGA/Gigabyte and Asus to begin with (not 100% on Gigabyte). Galaxy are included but I believe they are Americans brand.
I lose 3D if I go AMD, as my monitors have built in 3DVision 2 bud. It was 3D that got me back into gaming and I would hate to lose it but anything is possible.
Galaxy = KFA2 (offshoot of BFG iirc) so thats another brand to throw into the hat. I'd guess any Palit/Zotac etc... cards are likely to be branded as 'OCUK' if they make any

As for 3D, the upheaval to AMD3D I'd imagine would be a complete pain in the bum for you, sell 3 screens, finance 3 rather expensive 27" sammys etc...if 3D is what you love mate then do it.
Don't let all the bitter sounding "you're stupid for buying this card" comments put you off, most of those people are likely spitting the dummy out at something out of their financial means. Its the same every time a card in this price bracket pops up.