I too am in the great position of having just ordered a +4 and am working out the options, pretty much as above. Having read the previous posts I have decided to forego the strap - although it does look the part. I was also advised that sun visors are a bit of a waste of time.
I have seen some colour samples and I like the look of a two-tone royal ivory & bentley bronze (dark brown-ish). But I can't work out what leather would go with this - tan or saddle brown?