There will always be new cards and cheaper prices later. Nvidia's next chipset, Maxwell, will be released this year (first card potentially in feb, a 750 maxwell powered). However, that card you linked is loaded, and it should be able to play SC regardless, and absolutely tear through any game out now and released in the next couple years. So it's entirely up to your personal preference. Will you be able to get a more powerful card later? Yes. Will you be able to get that card cheaper later? Yes. Those will always be true, you eventually just have to decide when to bite the bullet.
Blurb about first rumored maxwell card:
http://www.tomshardware.com/news/nvidia-maxwell-february-launch-geforce-gtx-750-ti,25803.html Since it's rumored so close, you might as well wait and see how that card shakes out, might either drop the price of the card you're looking at or be a better value itself.