jabba degrassi: just to mix things up I'm also in the process of building up my first fixed gear and am loving it. depends on the person i suppose.

mrhedges: he said he's going to use it on the track. i think.

personally i'd build it up because then if something goes wrong/breaks you know what's on it so it'll be easier to find replacement parts. and you get the satisfaction of building a bike from scratch. just depends on how much the price matters.