I've pretty much narrowed it down to either the EHX Deluxe Memory Man, MXR Carbon Copy or a Boss DD-6 or 7.

Which one of the three would be the best? Or is there another out there that would be far better that's still in the lower-ish price range?

Cheers guys.
are you looking analog or digital. I ask because of the carbon copy I know is analog, and I think it is awesome, but you should try the ibanez analog delay also
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Analog - Youd be off to a great rig with a Carbon Copy.

Digital - I have an Ibanez DD-10 from the late 80's. Its a great delay pedal that has a real nice sound to it. The DD-7 from Boss is just Bannanas, 16 seconds of Delay? Sweet Tap-Dancing Christ! They want enough money though huh???
1981 Gibson Les Paul Custom (Black Beauty)
1980 Marshall JMP 2204