I love my ATC 20's and find they have a lot of bass. They go lower in a very transparent way than most other nearfields. They can be also much louder than Adams without clipping. You must check your room for a proper bass response before judging speakers.
I do have to say I usually have to raise the bass pot at the back of the ATCs to the full level for a correct bass setting in my room though.
I wouldn't go for a sub with the ATC20, but then I always have a big set of speakers with 12" or 15" drivers at hand for low end checks.
The end of the day I would go with what feels right for you and ignore what everyone else likes...
I wouldn't buy any speakers without testing them anymore.