Melt butter in a large stock pot over med heat

saute onion and celery in butter until tender

add crab meat, imitation crab meat and seasonings

cube cream cheese and add to pot

after cream cheese is melted add milk and heavy cream

increase heat to medium high

cube Velveeta and add a little at a time stirring constantly until all cheese is added and melted

add cheddar a little at a time stirring constantly until all cheese is added and melted