Multi effects suck...
I used to own a Electro Harmonix bass synth.....I loved it but I really didn't have a use for it anymore so I sold it...
Also, check out the Moog "Murf". It's a new pedal that Moog just put out that's supposed to be really cool....
If you have a shitload of money to spend check out
www.lovetone.com , they make some of the best pedals around...