Thanks Sandy for your response.

I've found the following plants so far:

Barclaya longifolia - does this have a dormant period?
Cryptocoryne balansae - background - med-high light
Hygrophila corymbosa v. 'siamensis' (Giant Hygro)
Hygrophila corymbosa v. 'Angustifolia' (Fine Leaf Corymbosa)
Hygrophila corymbosa 'stricta'
Hygrophila difformis (wisteria) - background, med-high light
Limnophila sessiliflora (Asian Ambulia) - background, med-high light
Monosolenium tenerum ("pellia") - foreground, low-high light
Pogostemon helferi (Downoi)
Rotala rotundifolia - background, med-high light

Do these sound feasible? Any other suggestions?