Agreed, if you're going to switch to Intel, a Skylake build will not only be roughly the same cost as a Haswell build, but will last you longer.
It all depends on your budget, though. If you're limited to 200 euros total, then even the Skylake i3 build @HIsgsz suggested is going to break your bank, as it swaps our your CPU/motherboard/RAM but leaves you with your old GPU (which is going to keep your performance down as well). If your budget is limited to 200 euros or less, for right now just go for a GPU upgrade. de.pcpartpicker.com is showing an R9 260X for around 120 euros, with a GTX 950 (another decent choice) running to 150 euros -- although, depending on your PSU, you may want to try to get one of the "75W" versions of the GTX 950. They're like a lot of the GTX 750Tis, where they don't need a separate PCIe power connector (ideal for lower-power or lower-quality PSUs, especially non-modular ones without PCIe power connectors), although the only model it listed was about 170 euros.