PoE macaronistudio builds

Hi Exiles, I've been playing for a little over a week, having fun (struggling) to learn the basics of POE, and could use some advice. I've finally made it to red maps and think its time to upgrade my body armour which I've been wearing since Act 1. I'd like to buy a 6-link, but not sure what to invest in. I don't have any currency at the moment, but will be farming some this weekend and it would be great to have a goal in mind. Here's my character: I've been happy with the Ghostwrithe chest (feel fairly tanky), but should I buy