i would highly advise you to LST your plant, you train your plant into whatever way u need it. i nearly trained my plant into a rectangular shape to fit better into my cabinet. lol
i just think it gives alot more control if your have a small setup. i am going to lst each time, as i will need to to make the most of my small space.
i LSTd a plant on my windows sill, then built a stealth grow cabinet after it was growing for about 3 months on my window sill. if i had not LST'd it would have never fitted where i need it...
here is a guide i found yesterday about Training plants, its got info on everything. i learnt alot more about LSTing after i read this...
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http://www.icmag.com/ic/showthread.php?t=115377