The best replacement for sbs 2003 is server 2003.

The best alternatives to sbs 2003 are rated as following:
★★★★★  server 2003
★★★  sbs 2011
★★  sbs 2003 r2
★  sbs 2000
★  windows server 2003

Your alternative for sbs 2003 is not listed? Suggest!
Speaking about sbs 2003, one probably shouldn't forget about terminal server.

Other search terms related to sbs 2003 and their ratings are:
★★★★★ terminal server
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sbs 2003
server 2003
sbs 2011