What processor/mb/graphics card should I choose?

I am going to be building my first rig soon, and I need an explanation on what setup to choose.

I am going into computer science in college, and I also play quite a bit of video games as well as stream high def video files, and I want to be able to use my non-cpu-integrated graphics card to enhance video game performance. I've been doing research on p67 and h67 motherboards, but I'm still confused about how it works. I don't really have a need to overclock, so I was leaning towards h67, but I am not sure if the h67 allows for a standalone graphics card in video games and video playing. If I get the h67 mb, can the video card still be used in conjunction with an i72600 not unlocked? I want to get the best out of my fps but dont want to shell out the extra hundred for an unlocked cpu and p67 mb if the h67 is capable of this.

thanks. also, if you have found any good deals on graphics cards like the gtx 560 i would be grateful for a link.