OT: guitar fx pedals

[CRM-114]

I need to add some effects pedals to my guitar rig, so I'm seeking opinions on the gear I'm considering. The main things I need are distortion and delay. Here's what I've been looking into:

-- BOSS ME-50 multi-effects unit, which has 11 types of distortion, as well as delay and a number of other effects. If I were to buy this one, I shouldn't have to buy any other pedals.

-- BOSS DD-6 Digital Delay pedal, which seems to be about the best standalone delay pedal out there. I think this would offer more control over delay than the ME-50.

-- MXR M-151 Doubleshot Distortion, which has two separate channels, so I could have two types of distortion that I could easily switch between. I've never used anything by MXR, so I have no idea how well they usually work.

I could buy the latter two for a little less than the BOSS multi-fx costs. Have you guys used any of these, and which do you think is the better deal?