Is this a good build for a graphics intensive computer?

If you can upgrade the CPU to i7-2600 because it tends to be better in graphical designing because of 2 extra physical and theoretical cores and larger cache memory. Also if you can go for a HDD with 64MB cache (2TB - 7200RPM, SATA 3.0Gb/s, 64MB Cache), and pair it with a SSD. It will be good because you need quick load times. And I'd really change that GPU, but Dell doesn't seem to offer any good solutions, so I'd go with the cheapest one and buy GTX 580/570/460 (because of CUDA) or the new Quadro series (which is for designing) etc. afterwards.