So my dad is getting me a new laptop in the States with a budget of 600-800 dollars (I think) with maybe a 15" screen size at the most and I want one that's good for school and not that high-end gaming (No Dead Space or any of those extremely detailed games, something for at least DoTa or SF at medium to high graphics)

I have considered both Sony Vaio and Dell XPS but my dad has considered HP laptops but they have Intel HD GPU only do that's bad

Any suggestions? (I'm not taking any Mac suggestions)