Picked this up the other day, and i already have 1 Xbox 360 dev kit (albeit not as nice as an xna). This kit looks to be an Expo model with the logo on the sidecar and blue lights. Didn't know what it was worth? No broken clips, overall good condition (some dings on the shell) and it still has the under faceplate sticker intact.
Definitely worth more with that faceplate. I would say 1700-2000. Just cause there are only 5 of those faceplates' in the scene and only 3 are active (including yours).
I don't think the faceplate is worth $700 more..... The most they went for was $300 and that was with stickers identifying the console and other things on the faceplate. $150-$200 I would say for the faceplate but @drahcir could give a better estimate
There's no way this will go for 1000$ as that's to low, however going OVER 2000 is a looooong journey and you might never find a buyer. 1600 is the going price for Great condition XNA's