Upgrade or build new

[silverjay928]

Hello i have a system with my little bro, i5 3570k, r9 270x, 16gb ddr3 some ASUS board i cant remember and a 500 gb kingston ssd and some hard drive i cant remember, he had the i5 OC to 4.8 on a 212 evo and ran good probably caused it to die early but beside the point
the i5 is dead and thats the reason we are here, cant really get much out of parting it out
If i upgrade ill go to a i7 3770k and a 580 4gb (or 8gb since he does 1080p?) 
which will run me roughly 500 -550 
some local and ebay option show $90-$200 for the i7
and online a 580 is about 250-400, im aiming in the 300 range
or a new rig that can do high - ultra 1080p, AAA, fps, cpu intensive strategy. etc
build list and prices?

[jiyeon]

I always recommend going with a new rig, mainly because there's little value in prolonging an aging PC. A new rig will enable you both to play virtually any game you desire. The reason I say this is because I don't see the point in spending like $500 now and then having to spill another huge amount on a new machine, you might as well get that new machine now.

[nick name]

Well the only things you will be able to keep are the drives and probably case. The PSU I won't guess on. In my opinion you're gonna be throwing away money with buying components that old and or weak and I would encourage you to decide a budget. Then see what you can build within that budget. From there see what you can reasonably expect in performance from that build. That is the order of steps I would take when trying to decide. If your budget can't build a PC that will satisfy your wants then decide to wait and save or buy used components for your current build.