Cook pasta in rolling well salted boiling water just under the time on package or al dente. Drain into a colander, rinse briefly with cold water and allow to drain. In a medium bowl, combine the celery, red and green bell peppers, onion, salad cubes, vinegar, seasoning salt and black pepper. Mix well. Fold in the mayonnaise and the sour cream blending well. Taste and add additional salt if needed. Fold in the pasta, cover and refrigerate overnight or at least 4 hours. Fold in the cheese before serving or up to several hours if needed to transport is fine.