In all seriousness, i am a big fan of the stomp. I think it's a great device. I'm not the type to dig deep into multi effects, but at a surface level I'm very impressed with it.
The stomp would replace a lot of what you have or at least make it redundant.
If you want to augment what yoi currently have, what about a plethora X3? It will give you all the delays and modulation you're missing in a tidy package for a good value.
Get an HPF/LPF combo pedal, stick it under the board and boom. You wouldn't be able to insert it wherever you wanted though
Too much?