Sounds like a reasonable discount. On stock 950 should perform much like 2500k, albeit marginally worse. When OC-ed, 2500k leaves 950 way behind. So, if you don't plan on OC-ing your system, and you can get it for a better price - it should be a good choice to go with 950. Plus, then you can go with triple channel RAM which translates into 6GB which are cheaper than 8GB if you want to have more than 4GB of RAM which I would recommend.
