DarkStalker, I also agree: If you got a decent GPU for gaming, better wait until next Dx 11 GPU gen.

I will recommend SDD HDD (64 GB / 128 which are afordable in price: but I wont bet on raptors HDDs)

People! I always buy graphic card with latest technology supported, but shadow example from pictures is not worth our money. That is a little graphic trick that can be done also with directx 10(even with directx 9!).
I say wait for the 2-ond generation of directx 11 cards and let's see how many dx11 games will be made in next year. Don't be naive, 'cause just as in past it will not be such radicale difference like between shader model 2 and sm3 it was. Be clever and wait, your dx10 cards are more than capable to shine for a while little longer. Rather buy yourselves a stronger cpu or raptor hdds.

As said: You might still hope, that more games will offer DX10.1 support, when similar features are developed anyway for DX11. With usually <25% share of vista in gaming-communities, DX10 support was a low priority in the past and with the group of AMD-GPU-and-vista-using-gamers beeing even smaller, DX10.1 would have been a waste of time.
But with the big interest in Win7, soon a very large proportion of gamers will run DX10/10.1/11 operating systems and with ALL HDxxxx-Cards and even some new Nvidia units supporting DX10.1 (but not 11), the implementation of 10.1 tesselation should be much more attractive.

(though I personally still wander, what sense it should make. Imho current GPUs are mainly limited by their shading-capacity and memory bandwith, not by the PCI-E connection. A system, that allows easy transmission of high-detailed geometry to the GPU, but changes nothing in the rendering process, doesn't seem to be a big benefit in this situation)