The best replacement for 690 is 780.

The best alternatives to 690 are rated as following:
★★★★★  780
★★★★  titan
★★★★  770
★★★  7990
★★★  780 ti
★★★  680 sli
★★  680
★★  670 sli
★★  7970
★★  760
★  770 sli
★  290x
★  gtx 780
★  790
★  gtx titan
★  780 sli
★  titan black
★  two 680s
★  990
★  dual 680
★  590
★  x challenge
★  500 exc
★  687
  7970 crossfire
  gtx 680 sli
  r9 290x
  hd 7990
  antec 900
  2 gtx 680
  klr 650
  nvidia 7050
  xr650r
  680 4gb
  7050
  760 sli
  990 ktm
  radeon 7970
  530
  t7400
  pro 78
  titan sli
  1023
  te 610
  gtx 780 ti
  hd 7970
  670
  6990
  f800gs
  yamaha 660
  685

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Speaking about 690, one probably shouldn't forget about 680.

Other search terms related to 690 and their ratings are:
★★★★★ 680
3770k
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Google Trends

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690
780
titan