System Usage from Most to Least Important: Gaming, Streaming Gaming, watching movies (not video or photo editing), office applications
Parts Not Required: keyboard & mouse
Preferred Website(s) for Parts: Newegg or Frys
Parts Preferences: by brand or type: Would like any intel based system with an nvidia card, I've done amd and radeon but not my personal preference now.
Overclocking: Prolly not
SLI or Crossfire: Yes
Monitor Resolution: 1920x1200
Additional Comments: First time building a PC (have always had friends assist me with it, but its time I did it myself), so little concerned about putting it all together correctly as well as not having a bottle neck from too little memory or processing power.
Want to make sure I get the cable management correct.
Concerned about heat management due to living in an arid environment on the upper levels of an apartment that tends to get warm in the summer.
Also, some friends were telling me to wait until April when the new intel chips come out for potential price drops or a better chipset for the same price as the sandy bridge chips.
Unsure what would the best power supply for this system.
You shouldn't choose the HDD you listed as it is an IDE drive, I believe modern Intel chipsets don't natively support IDE anymore, so there will be very few Intel chipset based motherboards that will support it.
To support a system with two GTX 580s you will need a PSU with two 6pin and two 8pin (6+2pin) PCIe connectors. More than that you will need 850W as a minimum, 1000W preferable. However even with a system with two 7970s an 850W unit is more than enough.