The boss re-20 is a great delay pedal.... IF you like the sound of the old Roland space echo.
It is a pretty accurate model, yes I have compared them side by side and I was impressed enough that I now have 2 boss re-20s... They just work well for me.
If you don't like the Roland space echo sound, do not get one.
It works well in an effects loop, which is where I run mine, and I run mine 100% wet in a parallel mixer. Some of the modes include reverb, just like the original.
The boss dd-20 has presets, the re-20 does not.
The dd-20 also works well in the fx loop, and has alot more modes to choose from.
Both very useful.
The delays that I use with my various guitar rigs are:
Boss re-20 (x2)
Boss dd-5 Boss dd-7
Boss dm-2 (mn3005 version)
Electro harmonix deluxe memory man w/tap tempo
I also have
Diamond memory lane 2
Line 6 echo pro
But I only use them for recording as the options they afford me don't work well in a live performance context, although I do find them very usable for recording applications.
For what you have described, the re-20 would probably work well.
I have never used the line 6 pedal delays myself, the feature set just doesn't work for me.
I don't think they sound bad though.