Use 1mg/day of Arimidex.
Clomid is likely going to do the job for you for your PCT. If you add a week of HCG the last week of your cycle it will grease the wheels for you by blowing up your testes and getting them ready to start up again. So it's always a good idea.
If you're going to do PCT with clomid/nolva then use 100mg/day of clomid for a week and 50mg/day the 2nd week beginning two weeks after your last shot. Then use 20mg/day of nolva for a couple months.