If you can find one, I can't recommend the Chandler Stereo Digital Echo highly enough. Excellent clean & mean digital delay and fabulous analog-simulation delay, as well. It has a hi-cut switch and subtle modulation controls that can cop a tape echo sound which is perfect, except that it is pristine, where a tape echo is noisy. Short settings can give you a nice, dimensional 'verb, too.
It's the only thing in my signal path besides my guitar and amp.
They don't make 'em anymore and they're pretty prized, so good luck to you if you seek one out.