John,
Some other cool bean leaves are:
Seikai (as you know)
Jyukai
Unkai
These three are expensive.
Some not-as-expensive types that I like are:
Kuro Shinjyu (black pearl, very small with a 1" leaf span being mature size)
Ao Shinjyu (blue pearl)
Beni Shinjyu (red pearl)
Isechabo
Ootakamaru
Suikaden (imperial flag, love this one!)
Hougyoku (very small, and I do have a couple available)
That's all I can think of off the top of my head. I'm sold out of many of these, but you can always ask. I plan on getting a large shipment of den. moniliforme in late this month or early next, in which I'm going to include more neos. Neo requests are welcome at this time as well.
I can take a look at my bean leaf collection and do some dividing as well. Give me a few days and I'll send you a list

.
-Jason