I do not use Blu ray/optical drives often, only time i use it is to install things and if i am watching a movie i either download load it in high quality or just stream it inside of rent/buying blu ray disks
You could use the cheaper ASRock mobo, but I'm not sure it's ideal for a first build (does have its quirks). Have used cheaper, but OK case to allow for Ivybridge processor, and better mobo.
An alternative approach might be to save money, with a locked processor, which would free money for better case and GPU.
You would give up some ability for crossfire, but better GPU, you'd have much higher immediate performance. PCPartPicker part list / Price breakdown by merchant / Benchmarks