I'm the same, running H&Rs on original shocks and was looking into the B8s before my priorities changed and I took advantage of the group buy on a full Powervalve system.
Anyway, during my research, I asked Al at Awesome what the difference between the MK5 and MK6 B8s was and got this reply.....
"As for the Mk5/Mk6 kits, the part numbers were changed a year or so ago so that they were no longer any different between the Mk5 and the Mk6."
Sure enough, the part numbers for both on Awesome's site are exactly the same so looks like the difference is no more.
A BBK is next for me but after that I will be looking at shocks again but I now think my preference is for the Koni Sports.