Micro atx & Mini itx systems are becoming very small and can be quite powerful, with more than enough juice to power Traktor/Serato. I've built a couple of htpc systems and they can do a fair bit of gaming on them, never mind play tunes. These system are about the size of an average home amplifier or even a lot smaller.
The obvious downside is having to carry a reasonable sized screen around and the set up process would be a total pain in the arse if you are on after someone else's set.
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