Likely not as i7 isn't buyable yet. I would seriously consider if you need a new computer right now. Does your current machine fail to perform? I know my Opteron @ 2.6ghz still pulls very playable frame rates in that awful benchmark known as crysis. Its still a faster rig than 90% of the people out there with C2D's (due mostly to GPU).
My point is, maybe wait for the next Nehahem release (cheaper processors), or wait until C2Q prices come down. I'm personally waiting for the 32nm Nehalem's, as they will consume less power, be more overclockable (unless Intel messes up big time) and feature improvements that likely benefit the desktop over the the server.