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Well, there are a lot of big questions here, but to give some answers then fluff-wise,, Salamanders and UM have good relations with human armies, more secretive chapters like DA and Iron Hands less so.

Azreal is really to expensive for that kind of gimmick, I prefer him for 1500+ pure DA lists myself (Also, his FOC changes unfortunately only work on primary detachments, so DW/RW troops is not doable) . Tigurius could be good, but don't overlook the generic libby, he is dirt cheap in DA and C:SM and can provide good support, like divination for the DA and biomacny from SM, as well as the much-valued ASTKNF .Tigurius is nice for reliability, but the cheap options are often better in terms of allies.

As for tactical advice, I'll link you to an article I wrote recently on using SM allies, rather than repeating it all here: http://antorsfinest.blogspot.co.uk/2013/09/space-marines-as-allies.html

Hope that helps.