The best replacement for 650 is 660.

The best alternatives to 650 are rated as following:
★★★★★  660
★★★★★  650 ti
★★★★★  7770
★★★  700
★★★  treo 700
★★  550 ti
★★  750
★★  7850
★★  560
★★  7750
★★  760
★  560 ti
★  7790
★  250
★  260x
★  dr650
★  600
★  1100
★  treo 600
★  klr
★  800 down
★  i5 750
★  dr 650
★  treo 680
  460
  hornady
  5770
  i730
  700p
  6850
  dl650
  680
  v-strom 650
  570
  680 rincon
  klr 650
  400
  treo 700p
  1050
  gtx 650 ti
  hd 7770
  1000 v strom
  630
  kawasaki versys
  bmw 650
  m6
  honda silverwing
  sv650
  ppc 6700
  650i
  gtx 560
  awwa d100
  550
  tiger 800
  6670
  xr 650
  blackberry 7130e
  xr650l

Your alternative for 650 is not listed? Suggest!
Speaking about 650, one probably shouldn't forget about om pill.

Other search terms related to 650 and their ratings are:
★★★★★ om pill
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Google Trends

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650
660
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