Defense Advice

http://imgur.com/a/f3ylm Hey guys! Can I have some advice on my defense? Do you know any "semi-inexpensive" end-game players I should pick up? I definitely feel like my corners and safeties are my Achilles heel, and I'm building Deion slow and steady. Thanks a lot! Edit: I currently have Emmit and Gronk, and I'm working for the other league players and Odell.