With rendering the better the GPU the faster, a 7870 is better than many other cards, and again there are many other cards better than the 7870, to be honest, most any card you have or get, there will always be a better card....I'm a strong believer of sticking within your budget. That's just the way it is. My son used a 7870 for quite awhile and was happy, until he had a chance to use a 780, then he was driven to get a 780 and have no doubt if he gets a chance to play with a 780TI or Titan or one of the upcoming 8xx series of GPUs he'll be driven to get one of them
Just the way the wonderful world of computers is