Buying a new SP doesn't always give you your cake and allow you to eat it too. I bought an NES special edition SP about a year and a half ago from Circuit City. I had to go open and look at three different SPs before I found one without a speck of dust that glares through the screen. Now over a year later, a speck has shown up. 2 out of 3 with poor quality control, and now the third one has the infamous speck. Those are terrible numbers. On top of that I have also fallen prey to the "Cannot read disc..." error on my Gamecube.
I have an original NES, still works, my friends have dropped an original NES from over 15 feet onto concrete just to see if it would still work... It does. I have an original gameboy, works amazing, I have a SNES, still works. I even have a Virtual Boy, I played it just a week ago. My N64 is still going strong. However, now it seems like their quality control has just gone to the dumps. When it comes to Nintendo these days, I suggest you only buy used and cross your fingers it is playable. Otherwise you are just paying higher prices for new and still crossing your fingers it is playable.
The only upside to buying new is the fact you can send it to Nintendo and have them repair it for free. But that is only if it screws up within the warrenty period. Ninty days after you buy new, you are crossing your fingers for the rest of your life. Nintendo just isn't worth it anymore, they are worried more about trying to make the next big console technology breakthrough, than their customers.
Maybe I will buy a PSP and a 360.