Core Component Upgrades (Urgent Help Needed)

•• Hi,
i'm looking to upgrade the cpu, mobo, gpu and possibly psu for my current gaming build. ••

•• first off, here's the build
htt p://p cpartpicker .com/p /1Upv O
(remove spaces, mpgh doesn't like links to pcpp for some reason)
there is no gpu because my his iceQ 7870 was defective. i'm open to suggestions for this one but please read the rest of this post ••

•• performance expectations: i like to game. i always try to push my games graphics while keeping a good gps (45+). usually run them about 80 to 90% maxed out so think high out of very high on arma 2 dayz. i will be playing a lot of these new titles like AC4, DayZ SA, etc. (Not BF4) ••

•• finally, my budget. since i'm still under my parents roof i still get pretty good christmas gifts so i'm probably gonna save the psu and cpu for then UNLESS i need a bigger psu for the gpu i get. as for the gpu and mobo i need to shoot for less than $450 ••

•• now based off of my current build, lets put together a budget beast (: ••