That offset would be perfect. 5mm in more in the front than my volks were. Check my pics. That would be ideal. I'd run a 5-10 out back for the wider rear look but +12 would look sick too. GET EM!
I had 19x9.5 + 17 up front and had no need for spacers not sure about that 5mm maybe even a z1 2.5mm spacer would work (have a set u could have for free if u want ) but +17 would look fine and that's what it would be with a 5mm spacer with those wheels up front.
Also hit up nick (esfourteen) see if he still has his swift springs. All aftermarket wheels need a drop on the 370 to really set them off IMO.