The best replacement for 5500 is 5500 sf.

The best alternatives to 5500 are rated as following:
★★★★★  5500 sf
★★★★  5300 samsung
★★★★  6300 samsung
★★★  6500
★★★  6200
★★★  z906
★★  6600
★★  5600
★★  9500
★★  5300
★★  9600
★★  5500ez
★★  9800
★★  5200
★  radeon 9550
★  ford f550
★  5310
★  5900
★  5600 xeon
★  4500
★  9550
★  5700le
★  radeon 9200
★  2300
★  14000
  fx 5200
  geforce 6200
  f550
  bose companion 5
  radeon 9250
  8500
  crossco 8500
  ford 550
  ati radeon 9250
  9250
  5500sf
  geforce 6600
  i3 3220

Your alternative for 5500 is not listed? Suggest!
Speaking about 5500, one probably shouldn't forget about different speakers.

Other search terms related to 5500 and their ratings are:
★★★★★ different speakers
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5500
5500 sf
5300 samsung