Troy, P. sanderiana & P. shilleriana are showier than many Phal species and I would consider that they are closer to hybrids. I'm probably confused a little bit about what you are looking for, are you looking for species with small flowers and lots of flowers per flowering stalk? Something like P. equestris var. leucaspis (normal type won't have many flowers opening simultaneously), P. pulcherrima, P. buyssoniana, P. chibae (and maybe P. celebensis)?
If you like something similar to hybrids (like P. schilleriana and P. sanderiana), there are P. amabilis, P. aphrodite, P. philippinense, P. sanderiana, P. schilleriana, P. stuartiana (and maybe P. gigantea).
For colony forming, P. pulcherrima forms multiple growths easily, and I've heard some (not all) P. lobbii will do it, too.
You can get info and photos here:
Phalaenopsis species by alphabetical order.