If you want a GTX 260 get the one with 216 cores, not 192.
The EVGA 790i is not compatible with DDR2 memory. Get a 780i if you want EVGA.
You can get Razer Barracuda headphones for $70 on amazon. They are better than the Piranha.
You're paying too much for that RAM. All DDR2 1066 is pretty much the same in a brand. Pick what brand you want(Corsair OCZ and G-Skill are good choices) and pick the cheapest set of DDR2 1066(Or 1200 if you want the max a 780i can handle) with rebate.