I want my new grand piano!
Get the software for US$50 (or add the optional Jam Pack for US$99), the keyboard for US$99, take some music theory lessons, and enjoy hours and hours of fun.
Update (8/1 13:50): After seeing the keynote, it turns out that the grand piano included in Garageband is a US$50K Yamaha. Jam Pack includes a US$150K Bosendorfer.
The keynote is good to watch. Highly recommended.