This is a good post, I know its no consulation to you but I was thinking of berks + invidia dual for my hr, I too have no illusions about massive improvements, it makes me wonder if spending £1500 for a small increase is really worth it!!
Just ordered full set of vred sessanta's today from camskill they finally got supply of rears, having them put on refurbed rays in gunmetal next week, happy days