Remember, the DL4 is not having 3 delays cause you can't use all or 2 at once. It just gives you more options. Honestly I would not loose the digidelay. Specially for U2 sounds.
Here are some options:
- get a bigger board
- put the DL4 off the board
- put a pedal on the DMM
- if your not going to use the loop option of the DL4 then don't get it. Get a smaller delay.
- get rid on the compressor (but thats coming from a non-comp user and I know you need your comp)
- get rid of the digidelay but send it to me. still have my address?