I have several R. digbyana and about 8 flasks worth of helenae seedlings (they are small, but then again they aren't going to get big)... Don't know if that helps.
I'm on the lookout for a really nice Phal. tetraspis, myself.
A well-established Angraecum elephantinum. I had one but it was a tiny seedling and we had a cooler, wet summer and it did not survive.
A really fragrant Haraella rectrocalla. I seem to be getting ones that are not fragrant. I had a really fragrant one once but I did not know about the extra need for humidity and lost it.
Catasetum schunkei (without breaking the bank) and pretty much any of the tropical Corybas species. Oh and Laelia liliputana (also without breaking the bank )
I would like to find Oncidioda Hula Halau 'Volcano Splendor'. This is one that my daughter picked out last year at the local show and died in the greenhouse heater failure. I lost a digbyana and a Bulb. phalaenopsis that I had found at a really good price that I would dearly love to replace.