Hello Ross, you can get as many different recommendations as answers hi. But my choice is the Audio Technica ATH-M50x headphones together with the AntLion ModMic microphone. This will attach to the side of the M50. It is an electret mic that uses the MIC1 connector.
M50x:
www.audio-technica.com/cms/headphones/99aff89488ddd6b1/
ModMic:
sunsdr.eu/product-category/accessories/modmic/
Footswitch:
sunsdr.eu/product/footswitch-ptt-ee-cp-01/
The above combination is used by several MB1 owners besides myself and was the preferred choice for the 3B7A and FT4JA DXpeditions.
The M50x requires only a little mid-range boost from the MB1 RX EQ:
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The ModMic requires very little adjustment from the MB1 TX EQ:
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Both are worth serious consideration.
73 de Erik.