Here is the NF7-S on newegg:
I'd go with the AMD. That is my preference (which may start an all out war). They are very close but I prefer AMD. AMD is cheaper in price than Pentium also. For whichever cpu you get, the ones that say retail box come with a decent heatsink and fan. If you get the OEM cpu, you will need to buy a heatsink and fan separate.
And if you do choose a Pentium, you will need a different motherboard. I'm not sure which Pentium boards are good, since I only deal with AMD.
If your going for gaming a good video card is good. When I said get a video card with what is left, I was considering that there would be a fair amount from your 1000 left. A video card is probably the most important. I'm not a expert on them but I hear the ATI 9600XT is good. Do a google search for video card benchmarks for the game that you will be playing. They rate the different cards. If its a new game they might not have any tests yet but its worth a try.
Also, be sure to add everything up to see how much is left. Excel works good for this.