I vote for windows.
Then don't buy the card. We're not going to develop windows drivers for the card.
I should clarify that doesnt mean you cant use it in Windows with other bitstreams from other devs that choose to support it (Ill be supporting Windows where it makes sense). But, you really are doing yourself a disservice doing windows and running expensive FPGAs to mine.
On Mods and Credit Cards, work is still being done, but we should proceed under the assumption we cant take direct credit cards, since all the processors have essential decided Crypto isnt a real industry.