Hey so recently I built my first pc and am loving the results I'm receiving from it, but want to be able to run more graphically intense games. So my question is, if I were to get another graphics card (second one to either SLI or just run by it self), should I stick to similar models or can I use whatever? My graphics card currently is http://bit.ly/1Ky2sSi or Msi Gtx 970 if you don't wanna click the link. Any advice or information is greatly appreciated.