Upload & Sell: Off
With the cameras mentioned, I would never change to a new body. Save the money, enjoy what you have.
Then when a major update occurs in camera technology, acquire a camera at that time.
I went from a 1mp Sony to a Nikon D70s. WOOT!! Then my next body was the D7000, Major WOOT!!
If the next one is the last, wait for lasers and super images, they are coming!
Just IMHO. The small incremental change is little fun compared to the big jumps. Patience!