Most Wanted Aquascaping Plants

[urville]

I was wondering if anyone had a list or would like to help by contributing to my list(for an article) of the most wanted, hardest to find Aquascaping plants. By hardest to find I mean they are not readily found locally, may not even appear on Aquabid very often or are expensive when they can be found. Either way Thanks!

So far My list includes the following and comments on those are appreciated as well:

Hemianthus Callitrichoides
Mini Moss
Xmas & Taiwan Moss
Marsilea Hirusta
Tonina's
Downoi
Alternanthera reineckii
Blyxa echinosperma
Blyxa japonica
Bolbitis heteroclita
Chlorophytum biehetii
Eurichaulon or Eriocaulon (??)
Eichhornia crassipes
Gymnocoronis spilanthoides
Houttuyma
Hygrophila costata