Advice needed on upgrading

[MichaelK33]

I have a custom computer that I built about 7 months ago, here's the specs.

AMD FX-4100
ASRock 970 Extreme3
EVGA GeForce GTX 550 Ti (1 Gb)
8 Gb (4x2Gb) 1600 MHz Corsair Vengeance
Antec 400 Watt HCG

So I need to upgrade to keep up with my friends and their newly built machines. I am planning on lighting first to complete the aesthetics, and I want to focus more on performance. My video card, processor, and power supply will most likely be suggested, so which one first? Unless I go overboard on one piece I probably won't bottleneck, so just want to see some opinions. Also, don't be afraid to treat me like a noob, I know quite a bit about computers. Thanks in advance!

 

[barnsley]

How much are you willing to spend? Also,either way you go, the psu will be the first thing you need to upgrade.

 

[| raVen |]

As above, how much you can spend???
We want be able to help you if you cannot provide all info

 

[seumasbeathan]

Depending on how much you can spend I would recommend a psu and gpu upgrade

 

[TheDevilOnHoliday]

An SSD would be an idea

 

[s3ns3]

there are a lot of ppl who don`t know how much W a pc use .that antec can hold an i5 + gtx 660 no prob for example and still be at maximum efficiency in games(50-60%load).i would get a fx 6300(to keep the mobo) and a 7870(or gtx 660). now thats a fine budget pc.the psu can handle them no problemo