I'm currently looking to buy a desktop PC with decent enough specs but on a budget. I have found one that I'm interested in which is the Asus M11BB 8GB 2TB. However the graphics on the unit are AMD Radeon HD7650D. I would prefer to have dedicated graphics with memory but I can't seem to find any pre-built PCs within my budget that have them as well as a decent hard drive. If I was to get the Asus desktop would it be possible to upgrade the graphics card to a better one? And if so how hard would it be for a complete desktop building novice?