I want a new pc and need help of choosing full new or just some things!

Anthony AKA Salmon

Honorable
Jan 26, 2014
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Hi I got atm
Intel i5 2500K 3.3ghz
Gtx 560
4gb ram
1TB harddrive (i think 7200rpm)
PRE BOUGHT PC!
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and i want to play games such as BF4, AC4 and others on very high/ultra and i dont know if i should just go for a completly new pc except for a cpu if i use my old one instead of buying a new one.
Or if i should i go for some new ram, gpu and a ssd or should i just go for a completly new build!!???

So easly said: Full new pc except that i keep old cpu(i5 2550k 3.3ghz).
Or if i should just go for new pieces!

If im going for a hole new pc im going for:
GTX 770 MSI
same cpu as i have atm
intel 530 SSD 240gb
msi B75A-G43
Corsair vengeance pro 8 gb