well I would go for the 6th spot.since you are sure that you can beat him in 2 straight games.i am saying 2 straight games coz then you will have to pay the salary of 1 week only and u wont have to pay the salary of 1 week.and 2 games will definately be a profitable for you coz u will get 2/3rd income of your home game and 1/3rd from that in the away game and the combined will be close to your weekly income from a single home game in a regular season.
in addition to this you will get a week of 3 games and this will be beneficial for your training as well.
I dont think most of the managers would agree with me but this is what i would have done if i would have been in your place