If you can afford it, try a thistle sock. The goldfinches, house finches and purple finches go thru a $10 bag (not that heavy!) in short order so I usually don't fill the sock but half full. Since it's not under cover, I'm especially careful if rain is likely in the forecast. For the bigger birds, they seem to like a pretty even mix of small seeds/sunflower seeds...I usually sprinkle some on the ground for the quail and doves who are uncomfortably large for the hanging feeder. There is nothing more peaceful than a couple of doves under the elm tree.   But I agree with MMario...around here they'd cost more to feed than the 3 corgis if I kept the feeders topped up all the time. I keep a sharp eye out for birdseed sales.