I recently picked up a set of black reach marines for cheap off of ebay, and have been playing around with the idea of a Raven Guard army. This will be a shrike list, although I will eventually have enough points to vary. I also picked up a box of assault marines, bringing my total ~750 points.
Eventually I will run shrike, 5 terminators with an assault cannon, 10 man tac squad with rocket launcher, flamer, powersword and melta bomb, 2 x 10 man scout squads (4 sniper rifles, rocket launcher, 4 combat knives and a sergeant with powersword, combi-flamer and melta bomb), 1 or two 10 assault marines with powersword and meltabomb. I will likely run some vanguard vets as well.