i can't believe the DE7 hasn't been mentioned yet, considering its popularity around here...!
i waited/saved for the DD-20 and it was SO worth it. for what you get, it's a bargain, really. i had been very picky about didital delays in the past, and was reluctant to spend less on something i would be unsatisfied with. -- the DD-20 made me very happy, right outta the box (a somewhat rare event).
if you can find a way to work, steal, save or borrow your way to a DD-20, you'll thank yourself later (i did, at least).
if i had it to do over again, and absolutely could not afford a DD-20 no matter what and could not wait, i would try a DE7 in the meantime, based on the rather glowing reports on this forum.