Overclocking can be a bit finicky (especially for GPUs) so it's not something I recommend for everyone :p With a 570 you should still be able to push to High though and there's no need for overclocking. Besides, the ultra supposedly demands twin high end GPU solutions to run smoothly so it's out of consideration for a lot of people x3
It's a solid card through and through, you should be okay for a while to come :3 The new gen of GPUs is around the corner but anything to go toe to toe with the 570 is still a good while off. I'll personally be buying a second Sapphire 6950 Toxic myself around christmas x3
EDIT: And somewhat off topic but my case got slightly damaged during the frequent quakes but with the insurance money I'll be getting a black and green phantom <3 Complete with USB3.0 on the front!