Buy the RAM first, if nothing else, but buy everything else by this weekend. The prices of most parts fluctuate as often as daily, so I can't guarantee that everything I listed above will stay around $820, say, next week.
I went with a retail Blu-ray drive as that comes with some media playback software. The OEM or barebones versions don't come with any software, and (good) Blu-ray software can cost upwards of $80.
I didn't include an SSD because a good SSD can cost upwards of $100. Plus, I normally recommend an SSD with at least 250GB of space, which costs over $150 for each of the more popular models. An SSD loads Windows and programs much faster than a hard drive, but it doesn't improve gaming frame rates as much as a good video card.
If you want to increase your budget to cover the costs of an SSD, I recommend the following:
The GTX 760 is a great card for 1920x1080, but it may be overkill for the majority of the Steam-based games you play. If that's the case, consider either the GTX 660 or the HD 7870 instead.
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