Soldato
Something like H+Son Archetype with black hubs + black spokes might be what you are looking for.
£400 would get you 1600g wheels with decent hubs I reckon.
edit: at 90kg maybe 32h/32h at the expense of a bit more weight would be a good idea?
hope to archetype/a23
The archetype is a massively stiff rim (I've got two pairs) and I think you would be fine with 28 spokes, depending on the hub. If I remember without looking (as I've also got Hopes with Open Pros) the Hopes have quite narrow flanges and therefore aren't great if you want to reduce your spoke count. Would be fine with 32 though.
For reference my Archetypes on Royce hubs with 32 DT Competitions are closer to 1700g than 1600g. My 28/24 Archetypes on CK R45s are 1550g with CX-Ray spokes.