Not sure any of these would be new to you but they are all I can think of.
I don't think his point is that Spike is dangerous so much as, well, Spike but...
Something New by dreamweaver
What if things had gone just a little differently when Spike came to Buffy for help after he was chipped? Goes seriously AU after 'Pangs'.He isn't in it much and I don't think Angel knows something is possibly going on between Buffy/Spike until he arrives when called by Giles, but it kind of fits...
Interpretations by Suzee
Spike is absolutely certain that after tying Buffy up and ranting at her and Drusilla, the Slayer's going to want nothing to do with him. But when a witch curses Buffy and then she comes down with a mysterious, possibly deadly ailment, he might be the only one who can helpI think this one fits...
Broken Betrayal by maryperk
Buffy's back from the dead and the secret she learned is a doozy. Spike always said magic has consequences.