Which defender for last upgrade?

[danoz]

My def is Goddard Gibbs Enright Delidio Adcock Lower Scotland (Jacobs Otten Puopolo)
with Heppell and Hibberd MPP as well.

This will leave me with 3 trades for finals.

I'm going for league, but one league is money for best overall.

Will be upgrading Lower, can afford all 3, but don't want to spend the extra 20k on Birchall.