Well, either AE Aego M, or maybe these new Corsair SP2500 speakers. Not sure how good those Corsair's really are TBH, without reviews. For £230, they'd have to be bloody good IMO. That's if you have very little desk space, and can only accommodate smallish satellite speakers.
Other options if you have space available would be a pair of larger active monitor speakers, or a stereo amplifier and some decent sized bookshelf/standmount speakers. Space permitting, if it were my choice to make, I'd get a stereo amp and some bookshelf speakers.
One thing you must consider, if you do think about going 2.0, is the difference in bass. Active monitors, or bookshelf speakers will have less, but far more accurate bass than over bloated 2.1/5.1 PC speakers. Some people don't like that, they like to hear overbearing bass, thus find cheap 2.1/5.1 speakers sound better than a decent stereo setup.
For £200 you can get a really good stereo amp and speakers. 2nd hand will buy you more for your money, but even new you can get some decent kit. Sound quality wise, PC speakers will sound crap in comparison.