the nashbar hubs aren't formula's, i have one of each, the nashbar's have different cutouts and axles, their both nice and perfectly serviceable hubs. just comes down to price...
like boston trevor said, bearings can be upgraded cheap and easy. its really only worth it in my opinion when the stock ones wear out.
also, like i've said before, the basic hubs can be upgraded easily if you have the inclination, don't diss cup and cones just because.
they have their place and purpose.