There seems to be enough interest for me to buy at least two flasks, so let's have a vote on what we will grow. The cost per participant will be under $20. I have five nominees:
Paph appletonianum
Relatively fast and very easy to grow, will likely bloom in 3-4 years.
Paph richardianum
A close relative of Paph lowii, but smaller and faster growing.
Paph Yellow Tiger
The picture says it all, likely slow grower due to the stonei parent.
Paph Addicted Philipp
Should be fairly compact for a multi, and a decent grower.
Phrag Grande
Faster growing than long petaled Paphs, grows into a very large plant.
All photos from slipperorchids.info