I decided to get the silver nickel ones since they looked alot like the originals, from looking at the Entwistle website the neck pickup version has a DC resistance of 7.0k and the bridge pickup version has a DC resistance of about 7.5k so they're a bit like the original Gibson PAFs as made in the late 50s, so the SG should have a bit of a vintage vibe to it's tone...hopefully.
I checked out a demo video of the Entwistle HV58 pickups installed in an Epiphone SG and I quite liked the tone, so that's another reason why I went for the silver nickel ones.
I've just bought one of those little vinyl Angus stickers off eBay, so it's all coming together.