Looking for a decent birdfeeder for the small birds. Any suggestions?

Had a plain feeder but the fussy buggers seem to drop most of the
seed, or rather spit it out in disgust! This in turn encourages ratty
to show up a little too frequently. I no longer have a table because
the pigeons seem to think its a toilet, and the doves think its a
bed!!
I put a tray underneath the feeder to catch the spill. Now the smart
ar** rooks have discovered they can cling to the tray and pinch the
seed...lol so thats no good either.

Any tips for a hanging feeder?