In my opinion it depends what you want , if you want a super clean delay especially at longer times then you won't get that from a PT2399 based pedal, whether it's DIY or commercial, the chip just can't do it.
You can make a very nice sounding delay with them though, if you want something warm and vaguely analogue sounding then the Rebote 2.5 is a great pedal, if you want something cleaner sounding then the Echo Base does that plus you get the modulation.
Supposedly the GFS pedal uses a PT2399, as do a lot of cheap "analog" delays, so it probably is similar to a Rebote 2.5. I had a listen to some clips on Youtube and it sounds Ok, definitely no better than something you could build yourself though.
The Memory boy sounds nice, but the Echo Base can do similar modulation sounds, and you can change the modulation speed without having to use an expression pedal.
What I'd do seen as how you've already got some of the parts is build one of the DIY delays and then buy something like a second hand Boss DD3 or a Behringer rip off. That way you've got a delay with a bit of character and a nice clean delay, that should cover most things.