http://www.johnlewis.com/231072508/Product.aspx?s_kenid=1518ef7d-9bde-50c9-f26a-000067ab05ee&s_kwcid=paidsearch£400 MM-1's
For this amount of money, you have quiet a lot of alternative products to choose from.
http://www.wharfedale.co.uk/For a cheap Hi Fi speaker, many of the Wharfedale range offer fairly good quality for a fairly cheap budget.
They start from £200 and up.
In fact, for £400 you might be able to get a half decent set of stereo speakers and a matching sub woofer.
They may not be labelled as multimedia, but their is no one stopping you from using them with your PC.
For example, I have a PC plugged into my 32 inch HD PC, with the PC, my freesat box and my Xbox 360 all plugged into a Hi Fi multi source amplifier, which is then plugged into a set of half decent Hi Fi speakers. (not surround yet).
By doing so, is a relatively cheap method of creating a great sounding PC / TV / Game Console, which knocks spots off the regular TV audio built into the HD TV.
:-)
And it hasn't broken the bank!!!