If the Costumer is picky... he will notice the DVCPRO HD Compression... ProRes visually is like Uncompressed so it's a good choice.
but..
ProRes it takes a lot of computer resources to uncompress, specially over the Graphics board.. on the Decklinks are sigthly better.
So what you will gain on bandwith probably will affect the overall performance of the system.
ProRes is a resoure eater codec!