Away from base: $100/day
Per diem: $60/day
Incidentals: Cell phone use and laundry: $5/day
My previous employer didn't have an away from base, but gave us $75/day per diem. We could often work 10-12 hours/day and get time and a half for anything over 8 hours/day, as previously agreed to by 3rd party clients. Bank it or cash it, it was an option available to you.