You're probably going to want a graphics card if you plan on doing gaming in the future. However why don't you just get the graphics card once you need it. Make sure you get a decent PSU with that HP.
Since I'm new to this, is the standard Intel integraphic graphics not a graphics card and be able to handle gaming? Or, would I be better off going ahead and getting the ATI Radeon? Also, when putting together the system, HP gives you numerous options of cables - do I need any of those or will the ones that come with the system suffice? Thanks you for help!