I dont want to overclock because I like my computers to last a long time. My current build is a p4 2.8C i assembled in 2003. I would like my next computer to last at least 7 years.
That's a mighty stiff requirement, for a computer to last 7 years. The core i7 is powerful, but not THAT powerful. Especially for gaming, where you need to upgrade your GPU every 6-12 months.
For gaming, the GPU is what matters most. You should consider an AMD build for budget gaming rather than an i7, because it will allow you to allocate more of your funds for the all-important GPU budget, rather than spending it on expensive motherboards.
Also, overclocking, if done properly, doesn't measurably reduce the lifespan of a computer system. (As long as the volts and temps are kept to a safe level.)
In short - a $1000 Core i7 build will result in too many compromises. The only reason to choose i7/x58 builds for gaming, are if you are going to pair up a couple of powerful graphics cards in CF or SLI. If you are sticking with a single graphics card, you might as well get a nice Phenom II X2 555 BE or X3 720 BE and overclock/unlock them, and with a cheap 785G micro-ATX motherboard.
As a matter of fact, at Microcenter right now, you can get both the CPU and motherboard for $100 + tax. It's a smoking deal, I got four of them.
Not to mention, if you get an AM3 rig today, you should hopefully be able to drop in a Bulldozer-based chip in a year or two.And if you get an 890xx chipset based board, with SB850, you get USB3 and SATA3. But that isn't available on the free motherboard from Microcenter.
I would re-think your need for an nvidia graphics card too. Right now, other than the 92 (9800GT, GTS250), and their high-end, the Fermi GTX480 and 470, they don't have much. Stocks are low on their other cards, as they may well be out of production. ATI on the other hand, currently has a top-to-bottom lineup of DX11 cards, that are great for gaming. Such as a 5770, which is great for budget 1920x1080 gaming. Or the 5850.
If you are stuck on NV, I would go no lower than a GTX470 at this point, although realize that the refresh part in six months or less, is probably going to be faster and cheaper.