With the Gigabyte board, I would simply re-iterate use the on-board graphics. There's simply no point in spending more to get a separate card.
I don't see processors as a "preference" item for one manufacturer or another - they're just a commodity where you get the one with the best price for the performance you need. And performance should be taken to include power consumption, as well as throughput.
I recommend you pay particular importance to getting a good, quiet, case, a good quiet PSU, and a top class heatsink/quiet fan for the processor.
The noise a system makes, and the heat it generates, is, these days, far more a factor to living with a system then the absolute zenith in performance.
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