I like gadgets, but for now I've already got what I want/need. The following would be cool though.

1. A higher-end telescope with some nifty electronics. (Every night I can watch the heavens!)
2. A projector. (I already have a laptop, using the projector I can watch the movies with the family in the living room, feeling moviehouse dba! hehehe)
3. A surround sound system to go with the projector!