Joe DeFuria said:Sorry, I don't understand what you're trying to say.
Here's my guess:
1) Release the add-on at about the same time you release the new SKU: say Fall '06.
2) Now there are two SKUs: "old" premium is gone. "New" premium is the HD-DVD model with hard drive. Still $400.
3) "Base" SKU is the same, HDD less, DVD based XBox...prolly $250.
Now, if you already own an XBox360, you can either buy the external HD DVD drive, or sell your machine and pick up a new premium.
If you're buying your first 360, you can buy the HD-DVD premium, OR buy the base. Note, there is still a "full upgrade path" from the base to the premium.
pretty solid scenario