Bryston options


So I recently purchased a Lumin T2 streamer and a 2nd hand pair of Martin Logan Vantages. So now its time to replace my 20y old Bryston integrated amp. Suggestions welcome.. 
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Why replace the Bryston if it is working fine and sounds very good? I have an even older 3B that is working trouble-free!
There is a Bryston 4Be listed here. You can connect the Lumin to it for volume control.
I'm planning on replacing the Bryston because things have moved on over 20 years and because I now have both a far better source and better speakers.  The Bryston is brilliant but I think its now the weakest link in my hifi chain...