If your "DJing on the side" involves you carrying around hundreds of records, you won't care about the weight advantages of the 12" over the 15".
Concerning image manipulation—you will treasure the extra screen real estate the 15" will bring you. Unless you have a quality external monitor that you can hook up a 12" to while at your desk at home, the 12" is not really suited to Photoshopping et al.
As for RAM—the sweet spot price-performance wise for Panther (the current Mac operating system) is generally considered to be 1GB. 512MB is considered to be a realistic minimum requirement (which the 15" PowerBooks come with in 1 SO-DIMM as standard). Thus, the 1.25GB ceiling for the 12" should not be a problem. If you have the funds to drop 2GB of notebook RAM in the 15"—then the 15" becomes more attractive again.
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