If you're building a Blood Angels army from a battleforce you're only get 5 guys with jump-packs. You probably want to think about assault squads, veteran assault squads and jump packs for Honour Guard and Death Company. That's maybe 40 jump packs in a pretty basic list.
Then probably attack bikes.
Of course, there are other ways to play BA - there's a discussion on shooty BA here, mech BA here and a 3-dread BA list with almost no jump packs here.
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