Got 1 million coins to upgrade, don't know where to start

Started playing MUT last week and have been grinding enough solos and getting lucky with some packs to have about 1 million coins for upgrades. The problem is that I am not sure where to start with my upgrades. Open to any suggestions besides replacing cam since he is my favorite player. Also, I would like to run a 3-4.

http://www.muthead.com/18/team-builder/866440

Edit: All players NAT besides TOTW cards