Here are all the finches we're at all likely to see: American goldfinch, House finch, and Purple finch.
Five goldfinches - one actually at the thistle-seed feeder
Pale purple finch and a chickadee
Goldfinch and house finch
Female house finch and cardinal
Cardinal, house finch, goldfinch, chickadee
A vivid purple finch (with a goldfinch in the back of the feeder)