Looking to buy a downrigger rod and reel. Sounds like the Convergence/4000GT is a common place to start. I was at a local retailer and asked which model of convergence for downrigger fishing for salmon in local Vancouver waters. His reply was that it didn't matter which version, they are all the same except guide ring location and he grabbed me the "casting" version. Is he correct, or should I look to exchange for the mooching? version? It's the 10'6" 12-25lb line med/heavy with a 3/4oz - 2oz lure rating that he sold me.