Unfortunately, these are two that I don't grow. But I do know that Pleurothallis marthae is the largest species in the genus (some accounts are of plants several feet high) and is more temperature tolerant than a lot of the others.
I do. Currently I grow P. restrepioides, P. teaguei, P. teaguei x gargantua, and P. canalingera (which hates me with a passion). I love the giant's so, marthae is definitely in. Something about them is so much more appealing than almost any other plant, let alone orchid.
I only have 2 Pleurothallis: restrepioides and roezlli. But, I am in love with all of the Pleurothallids! I really like the ones that have the flowers just at the leaf axils... need to get a couple more of those!
Make sure you post when your new additions arrive!