Must have gamechanging players?

Sitting on almost 3m with an 87 team. Every year I end up with a surplus of coins so I'm trying not to hoard coins as much as in the past but I also wont spend all my coins especially at this point of mut. I'm thinking about doing Polamalu Set as I have a few 87 UK cards. Mccaffrey looks great but the free Patterson has just as good catching so I'll probably pass on him. I'll probably focus on defense cause my offense is strong with Crabtree,Montana,Mariota,Patterson,Barry Sanders,Casper and the comp pass wr we just got so my offense is fine and my O-line is good with all 86-87 players. I feel like my team is good enough to win every game already so I'm looking for players that will make a difference. Those AKA players look great especially starting out with their x-factors so I might check some of them out. Lynch seems like he would be another Dickerson from a few years ago.