Why would he need more memory bandwidth, he plans like 64GB memory, which is the bare minimum, it does not look like as if he would want to use CPU offloading or CPU inference. The two RTX Pro 6000 will do absolutely fine on a smaller processor. He would not even need a system that new for it.
@Reflected3771 maybe you can tell us more what kind of models you want to use and what you plan to do with it in detail.
Off the cuff, larger storage might be useful depending on the models and quants you’re looking to use. Like H-i-v-e mentioned, sharing what models and plans you have in mind will certainly help.