OK, that last bit might make it interesting. Do you have a HDCP compliant monitor? else you'll be watching blueray at std dev, only HDMI/DP is capable of HDCP connections.
What do you mean by casual gaming. I'm trying to make sure we understand what you want, so that you aren't disappointed by the outcome, or unknowningly oversold on the capabilities of the system.
I really appreciate that because i am a bit over my head. Yes, my monitor is HDCP compliant. Casual gaming means not really an enthusiast, but occasionally plays games like Starcraft 2 or Total War series. From playing these I realized my system is just out of date and needs to be replaced. Basically, I wanted something with decent capabilities in speed, graphics, and power, but I don't need anything over the top.