hi,
I think monero is the best for r7 370.
If your card can do 1150 for core and 1500 for mem with claymore you can have 500h per card with -a 4.
Even if I could get 500h/s, that's only 50c/d. At 140W/card, and ~12c/kWh, 40c of that goes to electricity costs.