Can get gtx780 with this budget.

Intel Core i5 4690K RM749
MSI Z97S SLI mainboard RM519(hikari85)
Kingston KVR1600MHz 4GB x2 RM278
Zotac GTX780 AMP! 3GB RM1799
Seasonic S12II 620W PSU RM289
Thermaltake Water 3.0 Pro RM299
NZXT Phantom P240 case RM235
WD Blue 1TB HDD RM179
Plextor M6S 128GB SSD RM289
Liteon 24x DVDRW RM59
Dell S2340L Monitor RM559

Total - RM 5,254.00

GTX 780 should be able to handle BF4 fine on 1440p.

http://www.guru3d.com/articles_pages/power..._review,14.html

There are reports large multiplayer maps adds CPU requirements as well. i7 is inevitable.

LOL...you want 120 FPS and expect a single GTX 780 to churn that out for you? Try your luck on 2x GTX 780 Ti, even so it might not be able to consistently giving you that much frame rate also.