hi, i would go for a build. i am just about finished with my first build and to be fair as i added up what i have spent it came to £40 short of the price of a new fuji track. but the way i look at it i have learned so much building it that i will be able to handle most repairs/builds in the future. i have also gathered a load of tools that will come in handy, and i dont think i would have become so attached to an of the shelf fuji.
another plus is that when i do come to upgrading the frame i will have most, of the parts ready to go on.