The best replacement for d630 is d620.

The best alternatives to d630 are rated as following:
★★★★★  d620
★★★★★  d830
★★★★★  d630c
★★★★★  e6400
★★★★  t61
★★★★  d820
★★  e6410
★★  e4300
★  d430
★  dell e6400
★  d610
★  6910p
★  t60
★  lenovo t61
  thinkpad t61
  dell d430

Your alternative for d630 is not listed? Suggest!
Speaking about d630, one probably shouldn't forget about display problem.

Other search terms related to d630 and their ratings are:
★★★★★ display problem
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Google Trends

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d630
d620
d830