[VedalkenBear]

Just a note: The Angels seem to cause 4 Unrest a turn just by being there. (If you wanted a number...)

Upkeep of Occultist: 7.33g/turn
Upkeep of Angel: 6g/turn
Difference: 1.33g/turn
Break-even point: 52.63 turns

By this analysis, going by pure stats you have to have an angel for 53 turns before it's better than an Occultist in terms of money. You can put in the better Blood/Holy magic on the Angel in the same bin as 'causes unrest' and 'higher up-front cost' and it'll probably come out a wash.

For this reason, I think I'd use Occultists before I'd use Angels for Bloodhunters. Also, IIRC the Angel is a Spy in addition to everything else it can do.