Actually, GameStop decided not to take reserves because we have a limited allocation. I hope you are prepared to camp out because it will be first come first serve.
The launch date is April 29th and in addition to having the Elite system launch that day, GameStop will also get in black controllers, black play & charge kits, and black rechargeable batteries. If you don't want the system but want the bigger hard drive, the 120 gig HD will be available separately for $179.99 (I think) and will come with a cable that will let you transfer your information from your 20 gig HD to the 120 gig HD.