whats the best pre amp to pair with Bryston 4b cubed? A

Depends on, what kind of sound do you want and what loudspeakers you are driving. Can you help us out with that info? A budget would also help.

I’m going to assume we can pretty much start off fresh. Keep the Arcam integrated and...this is going to sound like a broken record but get a set of Triangle Deltas ( or better). The Triangles will give you what the Arcam doesn’t with the Totems. Tons of imaging and deep deep sound stage. A huge step up and well within the budget. Better electronics WILL get you more from the Totems but for the same money you can have your bucket list system that is way above a change in just the electronics.

So you have not bought the Bryston amp yet?