of two DS's I bought, one had two dead pixels, one had one, so three total. And just to make sure we're all on the same page, none of these are even dead pixels, per se (including on the PSP), rather, they are LIT pixels. Furthermore, on my DS that had two of them, one of them did fix itself (I've heard this happens maybe 10-20% of the time.
Anyways, I'd like to know what store you guys go to that are so nice that will let you sit there and try out systems until you find one in perfect condition. Additionally, you guys must be planning on getting your PSP's waaaaaaaaay later then when they initially release here, because, as happened when I did buy my DS and it had dead pixels, I couldn't exchange it even right that second, as they didn't have any more systems available to exchange for. And remember, PSP's are supposed to be even more limited supply than the DS's... even if you open your PSP right there and find that it's in all kinds of bad shape, I doubt most retailers would be willing or able to help you.
As a matter of fact, in my case, even if they HAD had another DS that they could have exchanged for mine, they wouldn't have. Seems retailers were under strict order from Nintendo NOT to exchange for any defective units, but rather, to have the customers deal directly with Nintendo, letting them repair or replace the unit themselves.
As I understand it, this is also happening in Japan right now with the PSP. A lot of people with some of the more serious problems did try to get their systems exchanged through the retailer, but there were either none available, or, the retailers refused and told the customers to handle the warranty thru Sony. And again, many people have stated that Sony won't cover dead/lit pixels unless they are in excess (of course, for most of us, one is already excessive)... something like at least 3-4 pixels.
Now... of course I am of the oppinion that most of these problems should be ironed out by the time they release worldwide, so this is probably a moot issue. And even if worse comes to worse, at least you will be covered by SOME kind of warranty, even if it means you having to send your new system in for repairs the moment it comes out of the box. In that case, you guys are right to just want to wait it out, as I didn't, and I did get screwed, and mine has much worse than dead pixels, and I'm pretty much assed out.
I will say this... I've been watching the whole situation like a hawk, and it seems that, subsequent shipments of PSP's in Japan have been deemed pretty much problem free, or at least, a much lower percentage of units with problems.