I agree that the accessories seem a touch expensive, especially the way Sony have tied up the memory card market, but I am so excited about the release of this next week.
I have my 360 on ebay to fund it, and I have decided on FIFA, Lumines, Uncharted and Wipeout to start with.
There are some very good bundle deals out there if you shop about. All of the above comes to £300, and I hope that most of that will be offset by the sale of my 'lesser' console