hmm, well, consider, that what the best hardware is today, and costs say, 2900$, will no longer be the "best" next month, and might even cost half as much.
If your animate about getting the best of the best and don't mind the large premium for it- OK, but I just thought I'd point out that often one rung lower then the best of the best offers a good 90% of the performance for probably 50% of the cost.
as For waiting; consider that there is always something on the horizon. Besides; you can always upgrade to windows 7 and get a DX11 compatible card afterwards.