I like Paphs and Phals, so would suggest for an easy intermediate grower:
Paph. lawrenceanum-$16 BS at Oak Hill
For warm grower I would suggest Phal. bellina-available at Oak Hill for $10, but I don't think quite blooming size. BS may be available at other vendors, but may be more $.
I would assume that these will be available other areas, but don't have time to research right now.