Like Elvis said, just about any modern delay will do, preferably one with a few different delay features.
I've had great results with the Boss DD-7; a good, middle of the road between fancy-schmancy and flea market. It offers switchable delay ranges, an analog sim, modulation, reverse delay, a looper with up to 30 or 40 seconds memory, and tap tempo capability. Oh, and it's stereo capable, too. Basically, it does almost everything the DD-20 does, just less of it, and it's a normal size Boss pedal. Reasonable price for what it does.
I was very surprised with the clarity, and it sounds very "natural." I'm not a shoegazer, so I just use it to get a little space when I don't want a dry signal, and I love using it for slap-back with the level boosted to thicken up a solo.