All fully upgraded items below 3k price need to reworked.
There is no reason someone should be able to complete a full item for less than 3k gold. Items that can be either need to be nerfed and given a further upgrade or they need to be buffed with a price increase.
This includes but is not limited to:

Every non-jungle, tear, or GP/5 support item that reaches the end of its build path before costing a minimum of 3k gold needs to be changed. There are no exceptions. With these items increased they should be able to hold their own fairly long against someone with an equally expensive build. I feel as though this is the core problem behind fullbuild ADC's mopping the floor with fullbuild tanks. ADC's items simply cost more overall and so they are PAYING for more stats. That is just an example, but I feel as though it proves the point quite well.