Actually I believe I made a mistake... You actually did yourself a favor getting the 570. Two reasons, the GPU is more a powerhouse than the 560s. Next, its an MSI Twin Frozr, which is an awesome custom cooler. The only card I mentioned that was worth considering over the 570 is the Radeon 7850
this is two of many links that could put your mind at ease.
Finally, VRAM is in ways important for certain GFX needs and 1.2VRAM can limit certain operations but..... you didn't make a mistake, that is a good card.