Personally I’d go black or polished silver.
Red does Work but usually only really in the absence of any other colour – so on plain black, white or polished/brushed natural. The orange highlights would ruin it in this case. Ditto Purple. Blue, maybe thanks to the outline on the logo and the complement to the orange.
I’ve asked myself the same question as the Mercury and Orange Soul is on my shopping list for after Christmas. If you like Hope, then all Orange is an option if you like that, but the more non- matching bits you mix in, the worse it will look IMO. Personally I struggle with Hope’s blocky industrial design, and just a headset and B.B. in ano would look silly so no problem… there are plenty of other parts that Work as well and cost no more.