I won't buy a PS4/XBO/Vita for any price right now because I don't trust 1st generation reliability for new consoles (So XBO/PS4 are out), and I don't need a Vita right now.
WiiU - $249 - This is the price it sold for on Black Friday, it's a good price. I'm just waiting for some games. I'll likely pick up a WiiU next fell when X releases.
PS4 - $299 - I don't need a PS4 right now, but when I get one, this seems like a fair price. $400 right now is a lot of money, and I don't want the PS4 that bad to spend a lot on it. Heck, I have so many 4th-7th gen games, I might even wait for a $249 price point, or a bundle.
XBO - $129 - Honestly I'd only be getting it for the exclusives. I don't need Kinect, so that immediately cuts the price to $299, and in a few years, with some price drops, I see $129 as a possible price one day, and I wouldn't pay any more then that just to get a few non-PC exclusives.
3DS - $149 - This is how much I paid for my XL
PSV - $79 - If Vita dropped to this price, I might get one. I don't really need one with so many 3DS/PSP/DS games, but I don't think the system will sell for any less then this, and I do want to play Uncharted & Gravity Rush. I have pretty much every console, I don't want Vita to be one which I don't own.