I personally have the corsair cmpsu-650TX 650w. I did the same as you and used all of those calculators and it ended up saying I would be fine with a 450w but I then thought I could just spend an extra 20 or so bucks and have more than enough power and not be limited in any way down the road. I don't plan on doing anything other than a 4.0 ghz OC, I will be doing no SLi or any other power demanding additions.
The 650w corsair can be had for 99.99 at newegg after mail in rebate.
PS, I hope you dont plan on ordering your rig from compusa :xhttp://www.newegg.com/Product/Product.aspx?Item=N82E16817139005