Multi-FX are good for some effects but not so great for overdrive/distortion/fuzz in my experience, which are the bread and butter of my effects.
You'll see that plenty of gigging bassists in your genre will use a Sansamp Bass Driver DI to add a bit of grit to their sound and to send an amp-like sound to the PA. Kind of an industry standard gigging and recording tool, definitely worth thinking about trying one out, as well as their VT Bass pedal.
Any idea what kind of effects you would find a use for? I use a low gain overdrive to boost when the guitars get louder and a Bass Big Muff to add to that when things get really heavy. Then a chorus or phaser is useful for slow passages, and you can also work in filters and octavers if used subtly in the right place.