The best replacement for 9800gt is 8800gt.

The best alternatives to 9800gt are rated as following:
★★★★★  8800gt
★★★★  gtx 650
★★★★  9600gt
★★★★  gt 640
★★★  6670
★★★  gt 630
★★  9800gtx
★★  4850
★★  gts 250
★★  gt 610
★  gtx 260
★  gt 430
★  gts 450
★  5770
★  7750
★  gt 440
★  6770
★  260gtx
★  5670
  gt240
  9500gt
  intel hd 4600
  550 ti
  3870
  gt 520
  4670
  gts250
  hd 5670
  4770
  4830

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Speaking about 9800gt, one probably shouldn't forget about 8800gt sli.

Other search terms related to 9800gt and their ratings are:
★★★★★ 8800gt sli
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9800gt
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