If you can make it to Target before midnight, you can essentially get one for $25 off. The deal is that you buy a 3DS in exchange for a $25 gift card. It all depends on you. I wanted to get a 3DS, but as I'm a college student spending that much money on a luxury is out of the question. If anything, get it while there is a deal. That's how I feel about it, anyway. They also are having a sale that allows you to buy 2 games, get 1 free [select titles, includes 3DS games].
I personally do not anticipate an upgrade for the 3DS in a while.. though you may wait if you prefer another color. At least, I hope there isn't another new handheld on the market soon! I haven't gotten past the DS Lite yet.