I would highly suggest that you wait a couple of weeks, and grab an AMD RX480 ($199) or RX470 ($149?) video card. They will be released on June 29th, and will provide you with far more processing power than the GTX 950 will. In fact, the RX480 benchmarks like a GTX 980 does, but where the 980 was commanding over $600 last year, the RX480 will be $199 for a 4GB card, or about $239 for an 8GB card.
Most of us have to upgrade a part or two at a time, and this is the year to upgrade video cards due to the massive increases in power while the prices have gone down. Next year should turn out to be the year to upgrade motherboards, CPU's and memory, since AMD should begin competing with Intel again with their new Zen processors.