I spoke at length with Nick at Pure before deciding on the rear strengthening kit, he advised he thought it would give the equivalent of the Whiteline set at 3/4 's. You definitely wouldn't therefore then want to have both fitted!! Definitely have all done at the same time - the wishbones will need welding so have them done along with the beam, likewise have the bearings pressed in the wishbones at the same time as the beam and then get them painted at the same time (or should it be painted then bearings?), will save a huge amount of time, effort and money. As for colour, rather than darker why not go with something contrasting and non-OEM, like yellow or gold or copper, or even light-blue or white....?