I've been happily looking up plants and further enlarging my wishlist on Orchidwiz
Per the list of plants in the first post that meet criteria, I wouldn't classify Den kingianum as an intermediate grower seeing that it needs a quite cool winter to bloom.
Some suggestions:
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Den tetragonum (might be too big, there's lots of size variation in this species, 2 to 20in!)
SBOE $25, Paramount $25-28, Nardotto e Capello (12,5€)
Pleurothallis restrepioides Up to 9in
Andy's ($18), Cloud's ($20), Burnham (£8)
Bulbophyllum ambrosia 5in
Andy's ($28 - will try to find it elsewhere cheaper), Cloud's ($25), Grobraschner (15€)
Sarcochilus hartmannii 20in in habitat, but cultivated plants about 6in
SBOE ($25), Paramount ($25-28), La Cour des Orchidées (15€)
Dave, if you would like me to check some things on Orchidwiz like I did in a past project, just sent me a PM with what info is needed!