The 11334 is a beautiful and well-made loco, for sure. I suggest you look at a popular auction site to see what they are typically selling for.
IMO your CW80 is a little under-powered for the new Crescent. For the best operating experience you should plan on getting a Powerhouse power supply, CAB-2 controller and Legacy base. Probably you realize this, but the new one is a full scale model, and much, much larger than your 1977 version. Regardless of what it might say in the catalog, the new passenger train is a premium product and will look best on wide O72 curves. You probably have enough room for those under your tree but when it comes time to build a layout you might find the larger curves very limiting, unless you have a full basement, garage, or bonus room to devote to the trains. So I would think hard if you really want to make the leap into "scale," or stick with traditionally-sized trains. Hope this helps!