You don't need a heatsink if you don't do OC, just use the regular Intel heatsink.
No offense but I use the Antec water cooler and get almost 20 degrees Celsius cooler than the rated stock fan. If your cars engine could run 20 degrees Celsius cooler prolonging your engine life for only $80 wouldn't you do it? Now to put the icing on the cake the stock fan is very noisy compared to the Antec water cooler so for a measly $80 you are prolonging the life of your CPU and its very quiet, well worth the investment in my opinion. I have build many computers for people and my number one rule to them is never use the stock fan cause for very little investment it'll save you more in the end.
How do you find these combo deals? When i usually look for combo deals, the 2 items are not compattible to my wants. i either want 1 of the item and not the other....
Get a 750w psu so you can add another one of those cards later on and still have a little bit of headroom. You have $1,500 and that's a $400 card so don't try to snake by with a 650w psu. Look at Seasonic, XFX (Seasonic OEM) and Corsair (also Seaonic OEM). Also that CM EVO comes with a small tube of great thermal compound (MX-4), so you can scratch the thermal compound off your list. And you want the updated version of that Seagate h/d...the 64mb cache. They got most all the bugs out with the revised one.
Combo to save some money on that revised hard drive.