I've got the forsythia planted, and my latest shopping trip, though still not as productive as I'd have liked, produced a red twig dogwood and a river birch.
The dogwood will take it's place near the forsythia. I think the contrasting bark colors will be nice in winter, and the forsythia blooms and red dogwood branches will be pretty companions in the early spring. The river birch will replace a sorry looking, half-dead Washington Hawthorn near the spot where the willow came down.
Although our neighbor's shed helps with the privacy situation, the back of the shed isn't much to look at. So I dug up three blackhaw viburnum suckers and planted them on our side of the shed. I hope I got enough roots and they'll survive the transplant. They're small - 2 are about 2-1/2 feet tall, and the third is only about 18 inches tall. Planted as they are on our side of the shed, it's ok to start small. Anything I plant in the void where the tree and other shrubs used to be will be as tall as I can get!
The viburnums will provide food and shelter for the birds, and they have lovely white flower clusters in mid-spring. We keep the viburnum hedge trimmed, so it doesn't bloom much. The three babies in back, if they survive transplanting, will be allowed to grow in their natural form, bloom, and get to their full mature height of about 15 feet, whereas the hedge is kept to about 7 feet.
Next up, I must find some willows! I want catkins to force! I like the ones with pink catkins. I hope I can find them. And maybe one more forsythia. That should just about fill the void, and I'd still like to add a couple of winterberry hollies. I'll need two - one female for berries, and one male for pollination. Oh, and I almost forgot, maybe a few arborvitaes to layer behind the deciduous shrubs. These should all do well in the moist soil back there, provide cover and/or food for the birds, and go a long way towards restoring our backyard privacy. We're making progress while impatiently waiting for the garden centers to get their shrub stock in.