4 regular bikes with 2 grav guns and a combi-grav.
For their first game they did pretty well..first soaking up a whole lot of shooting leaving just 1 behind, but that one guy put 2 wounds on a Wraithknight and killed 2 Wraithguard before valiantly sacrificing himself to d-weapon overwatch.
I also did 2 Grey Hunters with Plasmaguns, in case I want to swap out the melta I have now.
Now I'm pushing forward yet again and have started the 5 Sternguard..just need to dig up more combi-weapons.