The best replacement for 780 is 780 ti.

The best alternatives to 780 are rated as following:
★★★★★  780 ti
★★★★  290x
★★★  770
★★★  titan
★★★  290
★★★  690
★★★  r9 290x
★★  7970
★★  280x
★★  770 sli
★★  680
★★  1080
★★  760
★★  760 sli
★  7990
★  7950
★  1080p
★  r9 290
★  670
★  maxwell
★  780m
★  gtx 780 ti
  711
  790
  670 sli
  1020
  770 benchmarks
  gtx 760 sli
  gtx 690
  880
  gtx 770
  ss 700
  580
  sd 1200
  evga 780
  garmin 760
  785

Your alternative for 780 is not listed? Suggest!
Speaking about 780, one probably shouldn't forget about fx 6300.

Other search terms related to 780 and their ratings are:
★★★★★ fx 6300
★★★★ i5 2500k
★★★★ i5 3570k
★★ i5 4670k
★★ i7 920
★ i7 4770k
You have in mind a companion for 780 and it is not yet here? Propose!



Google Trends

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780
780 ti
290x