I'll third staying well clear of Dell. Better to build your own if it's gonna be a desktop.

As for OP? Integrated graphics do okay if you're using the CPU to render, and nothing else. HOWEVER, render engines are increasingly moving towards utilizing the massively CG-friendly firmware and instruction sets that GPU chipsets provide. Sure they can still shift to CPU if needs be (Iray does this), but pure GPU rendering on these render engines take only a fraction of the time that a CPU takes, and the results look way, way, WAY better for anything remotely 'realistic' in nature (and even does a bang-up job on cell- and toon-shaded renders.)

Long story short - get a decent GPU-based video card. It'll future-proof things a little for you.