Speakers for computer for dubstep.

What about some bookshelf speakers + a sub? 

Lookl into studio monitors I dont know wats available in europe in that price range, something with minmum lf a 5" woofer.

Or you could get the Paradigm A2?

destroysall.

Here is a small and simple 2.1 system within your budget the alternative for higher quality sound is going for a small stereo amp with seprate bookshelf speakers and subwoofer not sure what is good in europe though since he usual budget options from the U.S aren't available there.

http://www.amazon.co.uk/Corsair-CA-SP211UK-SP2500-Gaming-Speaker/dp/B004LWZ8ZA/ref=sr_1_32?ie=UTF8&qid=1354861132&sr=8-32

What is your budget? 

I am running KRK Rokit's 8's with a Lexicon Alpha audio interface, and custom balanced cables ($800 USD). This is by no means a inexpensive setup, nor a expensive one, but one that is capable of all music, especially dubsetp.

I used to have 2x M-Audio BX5 D2 with an M audio sbx10 subwoofer.. its fairly expensive, but the best computer speaker setup for the price range that you could buy.  I havent heard a monitor speaker setup that sounded nearly as good as that ever before.. plus there is a footpedal to turn the subwoofer off because that sub can shake the walls if the music is loud enough.  I highly recommend and if i didnt enjoy headphones more than speakers.. that would be my exact same setup..

As you quoted in £'s I am assuming you are in the UK.  You may want to look into something like this:

http://www.scan.co.uk/products/alesis-m1a520usb-active-usb-monitor-speakers

Simple plug and play USB speakers that are well within budget and should be ample for a small bedroom and reasonable listening levels.  If you wanted to spend a little more look into a USB audio device and active monitors from the same site, I have used them before and have found them to be both knowledgeable and helpful.  Also may want to look into DV247.com as a potential source, they are mainly London based but you would also be able to visit and test most likely if you give them a call in advance.

Consider 5" drivers as a minimum with possible sub, or increase the driver size to 8" and forget the sub.  Be aware that a sub can cause vibration in OTHER ROOMs of your house if not well located.  I used to have a sub on a bedroom floor with wooden floorboards, the room downstairs had a nice rumble even at low listening levels.

I would recommend auditioning and purchasing locally over a blind internet buy