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for trance, i would go for 4 octaves. you can get away with less, i suppose, but convienience factors come into play. 
also, seriously don't look at getting a keyboard with a million knobs. most people dont use them at all (just because mouse is so much more accurate and just as quick anyway) and not having motorised faders is well... pretty annoying. if you want a good surface for controlling your vsts or mixer, look into behringer bcf/bcr midi controllers. i had to learn this lesson the hard way, i took knobs over good feeling keys and have regretted it ever since.
on that note, make sure the keys feel nice. see if you prefer semi weighted, unweighted or HAMMER ACTION (ftw) then buy your keyboard based on that.
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