A mini system is great for DJing, since it's portable and can produce good sound, but don't skimp on the speakers.
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The Muteki XROSSFADE mini Hi-Fi component system. will get the party going.
A good idea for a mini Christmas lights system is to set your lights to music by getting a control system that is hooked up to your computer. You can buy one already built, or do it yourself.
Mini systems are good for home music studios, but consider getting monitors instead if quality is a concern.
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The Naxa Portable DVD Mini system with 7" LCD Screen & USB is a great gift idea.
Mini-systems can be used with a laptop, but you'll need to make sure the system has a mini-in port.
The Mini Maggie System is a full-range dipole speaker system that can sit on (and under) your desk.
Coke Mini System CD Player; this is sold kaccents online for about $180.
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The Acer Aspire 1, Dell Mini, and Toshiba netbooks are good choices.
microATX and mini-ITX are form factors for system boards.