Do you have space for a 5.1 system (3 speakers in front, 2 behind + sub) and the appropriate outputs on your computer?
Does your computer have an optical out? If so the DAC built into the speakers may be better than the one built into the computer (Although depending on the computer age it may not) so worth the extra. (Or not)
If possible try them out first.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).