The park has been really busy this week, so this Sunday should likely be busy too and it will be hot near 90 degrees. I would run to either Ghostrider or Hangtime first. Both coasters will have waits in the 1:30 - 2-hour ranges. Xcelerator and Silver Bullet will be closer to 1 to 1:30-hour waits. The rest of the park will range from 10 minutes to an hour waits.
Also, Knott's has early entrance for Season Passholders that day, so there will likely be lines already when you get into the park unless you have a Cedar Fair platinum pass.
If you have early entry and can get there well before rope drop, I would head to Ghost Rider first because the line seems to build up especially fast.
If not, I would head to HangTime first and then Xcelerator.