If you find an AudioNote AN-K or J in your price range, buy them, perfect for a small room as they are designed for corner placement. Very musical speaker and perfect for low power tube amps in your power range, basicaly they were designed for 20wpc.
Personnaly i find them better then the harbeths, Spendors at similar size. just finding a set in your budget will be the hard part, if you can stretch a bit it would be worth it.
Like these ones, note canadian $ so take 32% off and leave the standes behind should get you very close.
Audionote UK AN/JD hemp speakers with stands For Sale - Canuck Audio Mart