The Moog has been discontinued for a while, and fetches c. £600 used. One would be an
indulgence, two mental.
Does it have to be analogue? By which I presume you
mean BBD. The EHX Deluxe Memory Man gives over 1s of delay time and can be controled with
a cv or expression pedal. In fact, for cheap, the Memory Boy and DMB can also be
controlled externally. Korg, Boss, Ibanez and Yamaha all made analogue rack delays, but
you might be limited to the delay time and controls.
If it has to be rack but
you don't mind a good lo-fi digital unit, try the Digitech RDS 1900. It's 8 bit, gives
almost 2s of max delay time and has various control jacks, including CV in. I have two.
They're cheap and good. Also check out the 1/2 rack Boss RDD-10 or 20 - the Microrack
range have modulation i/o jacks and can be hooked together or swept via a CV.
Also fun is the Strymon El Capistan. I've not tried any Eventide but they get good
reviews. Analogue delay is over-rated, IMO, but if you know you want a particular sound,
there aren't very many rack analogues that have total external control. I suppose you
could rackmount almost anything if you strap it to a shelf, but Roland also made a rack
version of one of their tape echo units - RE-555 I think. Expect to pay plenty, if you
can find one.
--------------------my nerdy synth tech blog