What's an "Assault" rifle? Assault is a verb, rifle a noun. The rifle can't do anything by it's self, so that term just doesn't make sense around here.
Will there be an attempt to reinstall, and further, the heinous AWB (Public Safety and Recreational Firearms Use Protection Act)
that was brought to by the good folks of the Klinton Administration?
Thus I believe is the crux of the question you are asking.
First Obama has to win, which is possible, but I am going to be surprised to be honest.
If he wins, there will be an immediate run on gun stores by people looking to do exactly as you are questioning, get one before they are gone. Guns stores, in turn, will have already jacked up their prices to make ridiculous profits on soon to be unavailable items. Circle of commerce, nothing you can do there.
If he wins I absolutely do personally think they will try to re-introduce AWB part deux and make it wider in scope.
Once that is announced, prices will go through the roof, again, there will be an immediate run on the gun stores again, by people who didn't get in on the first panic purchase.
And by then it will be too late because backlogs will be in year time frame as they were in 1995 ish.
So if you can not afford to purchase a complete gun now, I would recommend buying something like an AR receiver, which is the only part that will need pre-approval for purchase.
Then you can build it down the line as more cash becomes handy, or you know for a fact that all the toys will taking a hiatus again.
Hope that helps. YMMV.