Dude i7 is a huge leap over core2. And you can also clock the bejiminies out of a 920, which by itself costs a fraction of the equivalent qx7770. A [email protected] creams a [email protected]SLI would be wasted, so a GTX260 would be more then enough.
Do you really need an i7? The performance hop over the Core 2 series is negligible, especially when you can clock the **** out of the 45nm chips.