Congrats on your purchases! I have about 15 Den species so I'm right with you on the Den addiction. I have trantuanii and it is small. I am so hoping the nub at the top is a bloom spike. The bloom is soooo attractive.
You might also try these:
carrii - I don't have it but it looks awesome to me.
sulcatum - I don't have it....yet. It does have a small winter rest.
mohlianum - I don't have it....yet.
laevifolium - I don't have it...yet.
moniliforme - I have several variegated varieties.
senile - I don't have it..it does require distinct winter rest.
unicum - awesome color!
lamyiae - similar to unicum but harder to grow. I've killed 2.
tetragonum - I have a nice hybrid. comes in small & medium sized varieties.
uniflorum - I have it and it is a very nice mini.
bellatulum - I don't have it...yet...can be hard to grow.
cruentum - This one is easier than bellatulum.
tobaense - hard to find and hard to grow. spectacular bloom.
trigonopus - haven't found this one yet. Flowers can last 2-3 months.
brevicaule - hard to find and hard to grow.
cyanocentrum - I killed some seedlings but I know how to grow it now. Fabulous bloom.
delicatum var parvulum - I'm currently looking for this one.
masarangense - awesome bloom. I've killed a seedling. want to try again.
subacaule - awesome bloom. I haven't found it yet.
canaliculatum - awesome plant. I have a division. It looks bigger in pictures but it is actually a mini.
carronii - same family as canaliculatum. I don't have this one yet.
You will be assimilated...resistance is futile! LOL. Welcome to my world.