The best replacement for 3850 is 4670.

The best alternatives to 3850 are rated as following:
★★★★★  4670
★★★★  3750
★★★★  3650 cisco
★★★  2960x
★★★  8800gt
★★★  3870
★★★  3650
★★  3750x
★★  2960
★  9600
★  4650
★  4670 agp
  3870k
  hd 4670
  hd 4650
  8600gts
  2900
  8800gt 256mb

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Speaking about 3850, one probably shouldn't forget about 3750.

Other search terms related to 3850 and their ratings are:
★★★★★ 3750
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3850
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