One of my oldest and most favorite varieties is an intergeneric hybrid between Smithiantha and Achimenes called xAchimenantha 'Dutch Treat' It is an older hybrid made by a master hybridizer, Patrick Worley. I love it's deep bronzy foliage covered with bright red hairs. It stays small, given good light, and a four inch pot full of rhizomes will produce a spectacular display. ...as it is doing for me now! Flowers look like little rusty red dime sized jewels with a bright lemon yellow center, striped with red stripes. It is literally covered in these little flowers when in full bloom. It is worth the effort to seek this older hybrid out if you haven't tried it.
I will always include the rhizomatous gesneriads in my list of favorites and my plant collection. They are easy to care for if given bright light and kept evenly moist while in active growth. The only caution is that drying out of the soil, often spells the demise of the plant. Rhizomes can be harvested and stored in ziplock bags in a cool dark place during dormancy, and replanted once they sprout next season.