Just wanted to tell you that I HIGHLY recommend a dome top cage for a sun conure. I'd gotten a playtop for my sun when we brought him home....more than big enough, thinking he'd love it, but man was I wrong. He HATED HATED HATED IT! I'm talking stand inside and scream for hours because he hated it. He's never liked to go to the top either. I only discovered by accident how much he loved dometop cages because my caique got on the playtop area of my sun's cage one day, so I let Ollie explore Pogo's dometop and he LOVED IT! Coincientally, it was just today that I moved Ollie into a dometop and moved my quaker to Ollie's playtop. He has been playing in there nonstop all afternoon, and has not screamed a single time....miraculous for him believe me! Conures like to hang and the dometop area of the cage is perfect for this. This is the cage I have, though I'm sure you can get it elsewhere for less:
Grey Palace 9003223 Dometop by A&E Cages Everything for Birds . I can't recommend it enough.