Which upgrade please

[mhvcbv]

HI
Which upgade will be best for me at gaming please.
I play all Call of duty, crysis 3, BF3 and Titanfall when released

pc specs now are.
Asus 27 inch 144hz 1920x1080 monitor
asus crosshair fomula z
fx 8350 @ 4.5mhz
16gb 1600mhz corsair ram
2 gigabyte 670 in sli (factory oc)
ocz vertex 256gb ssd.

Do i move to intels 4770k + MB or
upgrade to r9 290x, gtx780 or 3 way sli gtx 670.
only got about £450ish.

thanks

 

[mhvcbv]

cheers guys
looks like a new gpu then
was thinking of the saphire 290x as its price has come down a bit
or is it worth the lesser 290 still.

 

[mhvcbv]

ok cheers 290 its then
just got to find one now