if i were you, and this is just what id do, i would keep a multi effect for flanger/chorus/phaser/delay/reverb/envelope filter/compressor (my zoom b2.1u does that great, and iv had a lot of individual effect versions) and buy a good valve pedal for crunch and overdrive, a good synth and a wah pedal
my choices: i would go for zoom b2.1u, a DHA pedal of some sort (im sure Dave will be happy to help you choose a model), an akai deep impact or the new bass microsynth, depending on your budget, and a ebs wah one or bass crybaby, again budget depending