Get a Athlon 64 Single core for socket AM2, A motherboard with good integrated graphics like a Geforce 6150 based AM2 Motherboard, one GB of DDRII RAM or atleast 512MB, A sata II Hard Drive, A Micro-ATX case with a nice handle, and a decent powersupply.
A setup like this will be mobile, affordable, and powerful.
When you need to move it it would basically be like moving a gamecube...
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