MT-03 is perhaps a prettier alternative if you really are going to stay on the road? - same engine, just more street-bike styling, and that way funky horizontal shock! - in a street-motard kinda way...
Plenty on e-bay at the moment within your price range, and they are less likely to have been hammered or used off-road, which is worth considering?
Jx
eg. this one is not far from you in Kent:
http://www.ebay.co.uk/itm/2007-YAMAH...#ht_500wt_1147
Great price... you could spend a bit more and get one with a few less miles, but why would you when this is in such good condition - it's orange too to really suck it to your KTM riding mate x