Last or Second last midfield upgrade!

[Tank 22]

First of all my midfield consists of
M.Boyd,J.Redden, L.Montagna, J.Bartel, D.Swan,N.Foley
and Swallow on the bench as well as Didak who I have DPP with Mzungu.

Wanting to upgrade to Ablett/Pendles and I just don't know who to upgrade.

I have 9 trades left and $99000 in bank.

edit: my backline and forwards are pretty much complete so no need to worry about them.