Currently run a stock Medium Marsupial enclosed harness without any pouches. I'm far from an expert so yall can bash me, but over the past few months my idea of what a harness "should" and "can" do has changed. Before buying here's some stuff to think about...1) Think of the harness as a mini pack that can hold some survival essentials. 2) If you have a set of binos now, are you going to upgrade? If so will the size of the BH be appropriate for the size/shape of the new binos? 3) Go 1 up in size from what is reccomended with your current setup.
I used to have a 10x42 Vanguard which fit great, but once I bumped up to the EL 12x50 with the Aziak attachement I'm losing space to put stuff in the front pocket without making it a hassle to get my binos in and out. I do like my harness, but the Marsupial seems to be a minimalist BH, if you want to hold more on your chest you'll have to buy/make additional pouches. On a second run, I'd try the Alaska Guide Creations like BigNate suggested. The base Kodiak Cub and Alaskan Guide seem to have so much more space so for the price you get more per $.