Upgrading PC (Some Parts, Mobo/CPU/Power/)

[bioshredder]

Well first off, here's a list of my current PC build.

Case: CoolerMaster Haf XM
CPU: i7 3770 (non k) <----- Looking to upgrade (Plus a decent cooler, Air preferred)
Power: Corsair 500 CX 80+ Bronze <----- Looking to upgrade (Modular preferred)
Ram: 8GB of G.Skill 1600mhz ram
GPU: Galaxy GTX 770 2GB
MotherBoard: Some Asus brand worth around $80, 3 years ago (will update later can't find box it came in) <---- Looking to upgrade
Storage: 1tb HDD and a 120GB 840 Evo

Alright, I want to upgrade, well maybe its a downgrade to an overclockable i5. Also I would like to upgrade to a decent 600-650 watt Modular Power Supply, and to finish that off I would like to upgrade to a motherboard that would fit nicely with the i5 and the case etc.

My PC is for gaming just to clarify (i7 3770 will be going to a friend)

My Budget can go up too $600,Uh and with that I live in Australia (prices are higher)

 

[yumri]

For the power supply it is probably the only part which will be a good upgrade as it should supply cleaner power for less draw so i will suggest the Corsair AX 760i which is $234.14 AUD from newegg. then also the CPU to a i7-4790k $431.33 AUD again from newegg.
The rest of your system looks pretty much up to date as i will suggest not upgradeing the GPU until the 1000 or 1100 series comes around as the GTX 770 is still a good card but that is why i picked a slightly more effenect and more powerful PSU to make room for future upgrades and/or if you want to do SLI with the 770 of course.
In that save up another $100 AUD then upgrade as why upgrade to something that will decrease preformance? To this your rig is already close to the top as is so the parts to upgrade it back to the top 5 are pretty expenive.