Everything in the shield product line right now sells for 199.99 (Shield Tv, Shield Portable, Shield Tablet).
Shield TV comes in 16 gigs
Shield Tablet comes without a charger, stylus, or controller.. and is standard with 16 gigs
Shield Portable comes with 16 gigs and a 5-inch HD display (720p)
The NX wont sell for less than what anything in the shield line goes for imo.
The 3ds price issue at launch wasn't really about it being overpriced at the time. The product itself wasn't a quality product overall.. Small screen and pretty bad graphics with the 3d gimmick. The Vita which came out in the Fall of the the same year made the 3ds feel so outdated.
The NX can be priced at 250 to 300 ONLY if the device itself is a quality device, has quality software at launch, and is a good concept. If you can give me a portable with better graphics than a Wii U I think alot of people would be interested because that hasnt been done before in that type of form factor with great IP.. People are willing to pay more for less if the less is quality.. the iphone is an example of this.
The 3DS and the Wii U both suffered from similar problems in regard to the launch price- they had exotic overpriced components which the mass market had no interest in: the low resolution, stereoscopic 3D screen and the proprietary streaming technology in the Wii U. They really couldn't afford to sell them for much less than they initially did, which was a very boneheaded decision, and based on what they've said recently it sounds like one which they won't repeat.
Nothing that we've heard about the NX seems like a similarly expensive and exotic component. Detachable controllers can't possibly be as expensive as a small stereoscopic screen. So that leads me to believe they've returned to their philosophy of not using brand new, untested features which they abandoned for the 3DS and Wii U. This indicates that they can choose a pretty aggressive price while still making a small profit, and the MCV article backs that up.
I honestly think the price for the NX has little to do with the build quality or the perceived quality of the product- it's a matter of how much it costs to make/box/ship and how much they believe they can reasonably charge while getting a successful install base.
Edit: I love how the 3D screen is called a "gimmick" when that term really refers to a cheap addition designed to draw in mass appeal. The 3D screen was in no way cheap, and that was one of the 3DS's problems- same with the Wii U's streaming "gimmick." Motion controls on the other hand are extremely cheap to implement, so they won't adversely affect the price of the device nearly as much.