If you could stretch a little to
£465.00 you could get a Linn Classik on ebay (http://cgi.ebay.co.uk/Linn-Classik-Music-system_W0QQitemZ230145815745QQihZ013QQcategoryZ4787QQssPageNameZWDVWQQrdZ1QQcmdZViewItem) - which would be a good match for your Missions. Those are good speakers and any 'tiny' budget all-in-one mini won't do them justice... I guess the second-hand is the way to go if you have such a small budget, and Linn Classik seems like the obvious choice...- and you can find good deals on ebay or second hand shops...
If you don't fancy second hand, and would like to go for something stylish, also an interesting possibility would be that Fatman iPod dock - ITUBE, with valves seems like a very classy solution... (http://www.fat-man.co.uk/docs/product/itube_1.htm) - and it only costs 300 quid
Hope this has been helpful...
Razz