Live with A Hum vs. Buy An Outboard Phono Stage

It appears that I have an airborne hum that I can't seem to track down. I've done all the usual things (use cheater plugs, shorted ICs, etc.). Now, I am wondering if I should just ditch the whole effort, and buy an outboard phono amp, ala Bellari, Creek, and such. The turntable I have won't set the world on fire, but it does a more than adequate job if given the chance.

So, opinions please. Is it worth getting a phono stage, and plugging it into a dead-silent input, or will it suffer from the same thing?