The Quadraverb is a very flexible and controllable multi-effects unit with EQ, reverb, delay, resonator, flanger, phaser, ring modulation etc. It has midi control; 6 selectable realtime controllers based on which effects you have running in that patch.
The presets on the Quad are very good quality and inspiring to flick through.
It has flexible routing options and plenty ways to customize the sound. The resonator has 6 channels so you can produce some great pitched sounds with that.
All this for just £ 100
You can hear it here :