I too would focus on the screen. Not only in terms of color accuracy, but also in terms of resolution. Assuming a 15.6'' display, 1366x768 may be found as cumbersome for that type of work if that is the resolution you are looking at.
I'm not sure you will be able to find a reliable FHD notebook at that price, but perhaps an HD+. Although, if you are comfortable with just HD (again, making an assumption as that is the default on older notebooks) I would go with the i5, and maybe look into getting a cheap SSD later on if you can spare the money for it.