Nice gear man! I don't really think you need to upgrade anything but if you are itching to spend some gold.... maybe a nicely rolled Vile Ward for the looks. Or drop some gold on a amulet with higher CC%/CD%... but honestly I'd just farm XP and gold with the gear you have.
You could upgrade that IK helm for one with more strength, You should be able to get one with around 170 str. (Mine was around 20m with the pickup radius)
Maybe look for one with Dex as a secondary stat as this will boost your EHP.