Advice, Feedback on my team

[Payney_95]

Ok so here's the team:

Back: Goddard, Gibbs, Deledio, Grimes, Adcock, Heppel, Otten    (Puopolo, Duigan, Toy)

Mid: Swan, Boyd, Bartel, Anthony, Harris, Hibberd     (J Pittard, Atley, I Smith)

Ruck: Cox, Jolly   (Z Smith, Derickx)

Foward: Chapman, Franklin, Riewoldt, Sylvia, Knights, Petrie, Krankouer    (Mzungu, Prestia, Richardson)

Cash Left: 92,800


Here's the problems:
1. Ruck combo. Don't know whether to change to Sandi and a mid priced ruck. Who's a good mid priced ruckman?. Since I dont know who to choose for the mid priced ruck i have gone with the Jolly Cox combo.
2. Knights and Petrie. I know Petrie is out for round 1 but i dont know who to trade him for or if i should leave him in. If i traded him now i would probably get him in round 5.
3.Adcock. Whether to have him or use the 92,800 to upgrade him to someone. Someone to upgrade would be...? Or what about Deledio trading him for Broughton or maybe upgrade to Rawlings If i have enough money.
4. NOT have D Swallow. Is it worth an extra 60,000. Its either having Swallow or saving 70,000 and having J Pittard.

Any advice towards anything in my team, will be much appreciated.  :) Thanks