If it's not too late you might want to consider the Line 6 Pod Live. I can't speak to the actual sound of it, as I haven't yet had the chance to play around with it, but think about it this way.
- Edge used that DM4 (distortion modeler pedal) to create all the distortions for the new album. The distortions are all the same technology. (Read about it on the Line 6 website, they actual built him a one of a kind rack version for the tour that could be controlled by midi).
- It has all the amp modeling built in, could be good or bad depending on what you spent on your amp and if you like your amp's tonal quality. For most of these multi effects pedal, the best option is the most standard amp with no distiniguishing tone so that you can create your own.
- It has rhythmic delay built in with a tap tempo button. This means you can dial in your delays to get dotted 8th notes, quarter notes, triplets, etc. very easily. Edge has been spotted using of the delay modelers from Line 6 as well.
- The tap tempo button can also be used for chorus, tremolo and other modulating effects.
- It has individual controlls for each the stompboxes (distortion), amp modeling (switch between amp models), effects, and delay.
Some people really hate Line 6 stuff (usually high end guitar enthusiasts), but for the average person they get pretty damn close to the real sound. Obviously, some are better than others, but you can't beat it for value. It's only $400 and when you compare it on paper to the high end Boss, Digitech, and Vox units of comparable cost it kicks but. Like I said, I haven't actually played with it, but here's a quick note on the others. Boss GT-6 is really good, but the amp modeling is crap. This would be great if you have a good amp then you can just let the signal go through just the effects. But there is no rhythmic delay. There is tap tempo, but you can choose the kind of notes you wants to delay, then tap quarter notes. Doable, but not as easy. Digitech GNX, the really high end unit is a workstation, but I wouldn't want that. Their stuff sounds okay, but the amp modeling sucks and the some of their effects could use some help. The Vox multi effects pedal sounds really good. It has a tube in the unit to create real reverb and some good tones. Awesome buttons using the big metal push bottons instead of plastic like all the others, but this one is expensive (like $600 if I remember correctly).
And that concludes this portion of "Listen to a guy ramble on about something he thinks he knows about, but truly he's an idiot."