The i7 4770k wouldn't be compatible with a 1155 motherboard.
As for your upgrades, it depends on your budget, and what you're trying to achieve.
The your cpu + gpu is still fine for most games right now, it would be better to change the motherboard to something better, but then you'd be holding on to the system longer.
If you're just gaming and you're going to upgrade your computer, go with a i5 4690k + z97 motherboard. It'll be faster, but I don't think it'll have a huge difference.