@69zoso69 system sound is a very individual taste, only you can make the final decision on components and cables. With that said, take my comments as my opinions.
I use Mogami interconnects in my main system, and I think they offer a wonderful sound, and value. I build my own cables to keep the cost in check, and eliminate cable clutter. Each cable is made the exact length I want it. I have spent more on "better" bulk wire, and have a whole rack of interconnects that I have tested. There are others I have liked, but the Mogami really sounds great to me overall. Kimber PBJ is another cable I se as an outstanding value. I have another Kimber cable from "higher" up the line, and it's pretty good too, but I could easily live with the PBJ. I prefer my system sound signature to be warm and dynamic. I have McIntosh C2200 with Acrosound tube amps and GR Research XLS Encore speakers. I just can't justify spending $1000 on interconnects or speaker wires. Proportionately it makes no sense to me.
I would follow you dealers recommendation on the Mogami, get it in your system, and live with it for a while. Once you live with it and identify what you want to change, then start looking for a cable that fits that description. Maybe you will love the sound, and find yourself listening to the music and enjoying it, instead of wondering or worrying about how much your cables cost, what they are material or gauge they are made from, or what other people think of your selection. Good luck and don't forget to enjoy those new amps.