Jormungand felt like it had a very "western" vibe, I suppose.
It's about an international arms dealer and her elite squad of ex-military bodyguards getting into all sorts of shoot-outs, and stuff.
Princess Principal felt like it had a western vibe to it, considering it was set in London.
Mahou Tsukai no Yome felt like it had a western vibe for the same reason as above.
ACCA-13 definitely had a western, mostly European, vibe to it since it was set in a fictional nation (which resembled Europe) and whose regions drew heavy inspiration from various cultures, both European and and American. Very nice artstyle too, I'd definitely recommend this one.