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I like the look of the Yamaha HS5 and would they work fine as pc speakers?
Not sure pro monitors are ideal for multimedia type use, they are designed to sound as neutral and revealing as possible, if you get some with tone controls they will probably be ok.
If you do end up with an audio interface, I use a focusrite 4i4 (needed the extra inputs) but a 2i2 would be perfect and cheap enough!